It is the former headquarters of the British Secret Service.
Fitting accommodation, one might think, for hospitals boss Phil Morley, who once pulled on a Superman costume to dance down a hospital corridor to the tune of Amarillo in a video aimed at boosting staff morale.
Mr Morley's NHS credit card was used to pay the £817.50 bill at the five-star Royal Horseguards in London last December when hospital staff were struggling to cope with the influx of patients over winter.
The card was also used to pay a £1,284.05 bill at the Montague in London, six days later.
The hotel bills are just some of the transactions amounting to £50,056.44 spent on Mr Morley's NHS credit card during his three-and-a-half years at the helm of Hull and East Yorkshire Hospitals NHS Trust.
His card was also used to pay for meals at some of East Yorkshire's finest restaurants, including the Michelin-rated Pipe and Glass at South Dalton, the exclusive 1884 Dock Street Kitchen on Hull Marina, the Boar's Nest Farmhouse in Brough, Lazaat in Cottingham and the Mill House in Skidby.
Mr Morley rejected a £190,000 salary when he took on the post of chief executive in October 2010, claiming it was "too high", opting instead for £170,000.
On quitting the trust in April, he did not receive any payment from the trust other than holiday pay.
A trust spokesman said: "The only additional amount paid to Mr Morley after his resignation related to 13.5 days of accrued annual leave entitlement that he had not taken."
Until his departure, hospital staff had been using NHS credit cards to pay expensive bills at some of the same restaurants. One card was used to pay a £631 bill at the Pipe and Glass in March last year and a bill of £740 at the Mill House.
However, some of the bills were reimbursed by Royal Colleges and were not paid by the trust.
As well as expensive meals and hotel stays, staff also used credit cards to pay for a range of items, including flowers, chocolates and internet downloads.
One staff member spent £52.64 at Chocolatebuttons, an online store selling retro sweets in February 2, 2012.
Many of those transactions relate to lottery-funded events for staff, such as the summer barbecue, a fun day and the Christmas tree lighting ceremony, which did not come out of trust budgets.
Another credit card was used to purchase IT equipment but was also used to purchase £1,198.29 of items from iTunes in the past 18 months. The iTunes transactions relate to the trust's move from PCs to tablets and the cards were used to buy apps to assist its medical and non-medical staff.
Since 2010, 26 members of staff have held trust credit cards including consultants, PAs and managers.
Although 11 cards were withdrawn, 15 were still in use before John Saxby took over as interim chief executive. In the past 18 months, £961,812.68 has been spent on these cards.
Last year, staff spent £673,948.81 on NHS credit cards. Of that, £608,023.99 was spent on IT equipment while £65,924.93 was spent on travel, accommodation, meals and flowers among other purchases.
The credit card held by IT was also used on £795.68 from iTunes last year and also £2,148.88 on a music website in Romford, listed under music stores, musical instruments, pianos and sheet music.
This year, until the end of May, £287,863.87 has been spent on trust credit cards, including £256,426.06 on the IT card and £31,437.81 on non-IT purchases. The IT card also shows payments totalling £391.61 to iTunes.
Mr Saxby said: "There are lots of NHS organisations that use credit cards but we didn't have credit cards in my last two organisations. I have never had a credit card and that is a moral position you take.
"For some reason, a number of credit cards were approved for use by people. Most of them had pretty small amounts of money on them. In some cases, it was to do with purchasing around IT.
"People had been less than careful about the signing off. That has now been introduced. I just think too many had been issued. My advice is we do need to be careful about how this is perceived."
Mr Saxby said credit cards had been used in the past to make it "quicker and easier" for staff to purchase goods, including software for tablets and educational courses at external venues.
He pointed out although credit cards had been used to pay restaurant bills, the cost was claimed back from professional bodies, such as the Royal College of Physicians, and did not come out of the NHS or trust budgets in "many instances".
He said: "It is not possible for me to comment on why my predecessor paid for certain items with a credit card.
"What I am clear about, however, is my view that we should not be using credit cards unless it is absolutely necessary and we have taken steps to significantly reduce the number of cards the trust holds.
"Furthermore, when we are spending public money and using credit cards, we must take every step possible to ensure we are getting the best value for money.
"Our processes are far more robust now than they were previously. All chief executive spending is now countersigned by the chairman and chief finance officer."
The trust said Mr Morley has given assurance to auditors that his credit card was used for legitimate expenses. Mr Morley was approached about the transactions but declined to comment.
Ray Gray, regional officer of trade union Unison, said he was alarmed by the amount of money spent on all the trust credit cards.
He said: "I think the amount spent on hospitality is ridiculous.
"Staff are struggling to pay their own bills when they go to the supermarkets and I can't see them being happy about this."
Mr Gray said reducing the amount of people holding trust credit cards was "the right way forward".
With regards to Mr Morley's credit card, Mr Gray said: "He still has a lot of questions to answer."
Items on Phil Morley's credit card statementsYear by year, Phil Morley's credit card spend was:
2011: £6,376.02
Among the transactions were:
• £26.72 to Holiday Inn Blooms (February 2, 2011)
• £37.50 to Tiger Tiger, the self-proclaimed "ultimate party venue in Manchester" (July 7, 2011)
• £338.15 to the Mill House, Skidby (August 11, 2011)
• £281.43 to Waitrose (November 30, 2011)
2012: £11,068.32
Among the transactions were:
• £174.15 to San Luca, Hull (April 3, 2012)
• £378 Hilton Garden Inn, Birmingham (May 17, 2012)
• £14.50 Amazon digital downloads (August 20, 2012)
• £663.45 Bloomsbury Hotel, London (November 8, 2012)
2013: £18,249.07
Among the transactions were:
• £200 The Gallery, Brough (April 12, 2013)
• £325 Boar's Nest Farmhouse (June 7, 2013)
• £17.88 Greggs Bakeries (June 27, 2013)
• £817.50 The Royal Horseguards (December 5, 2013)
• £1,284.05 The Montague, London (December 11, 2013)
2014: £14,363.03
While Mr Morley left the trust in April, his credit card shows a refund in the May statement of £1,343.23 from getaroom.com, relating to a booking made on March 8 this year.
• Follow us on Facebook and Twitter
• Health news for Hull and East Yorkshire
