Just a word to the wise. London Hilton chains are now requesting corporate ID if you are using the discount codes.
it didn't impact me, as I actually had the relevant ID, but I was surprised to hear it twice from two locations, most recently Kensington. Never once in 10 years have they requested ID before.
Apparently staff have had a memo - which considering the dire shortage of rooms for the next week in London (one prime location is 1000GBP standard rate for a double next Sunday night?!) might be the reason why.