I covered lots of permutations here, based on what is important to you:

https://www.headforpoints.com/2019/0...ons-in-london/

Best VALUE - CP City, HI Mayfair, IC O2

Best LUXURY - CP City, the IC's, Kimpton Fitzroy

Best boutique - CP Kensington

Best for families - HI Camden

Decent value if low on points - Indigo Kensington, CP Kings Cross, HIX Wimbledon, HI Wembley, HI Stratford City, HI Whitechapel, CP/HIX at LHR T4, HIX Ealing

An odd example. Holiday Inn Camden puts its penthouse suite up for redemption at the standard 45,000 points. In terms of room size, this is probably the best bargain in London. Does it offset the Holiday Inn breakfast? Dunno, up to you.