*Update: the Metropolitan hotel has decided to honour all £18 bookings and booking.com is contacting the guests to inform them.*
The request was made by the Metropolitan and booking.com is working with the hotel to find out what happened.
It is believed more than 100 reservations were made at the 144-room hotel for January 1 and 2, 2014 at the £18 offer, which represents a massive discount for the trendy London hotel and may have affected a range of rooms types.
The Priceline-owned hotel specialist has also contacted consumers by email and phone to offer them the choice of cancelling free 0f charge or re-booking at the discounted rate of £149.
Prices quoted on the Metropolitan's website today start from £159 for a city room.
This thread on the MoneySavingExpert forum shows how the offer played out.