Thanks Simongr
I checked my records, and the two Hilton's I've stayed in at London are:
Hilton London Islington
Hilton London Kensington
I liked the Islington. It's a pretty modern (but very basic) Hilton. Probably similar to Hampton Inn's in the US, or Holiday Inn's here. I remember it being close to a tube station, although can't recall which one.
The Kensington was an old hotel, but still reasonable. Service was very average and the room old. A smallish walk from the nearest tube station.
Both were very overpriced, but I don't expect much from London hotels.
As I indicated, I have a one night award for the Metropole coming up soon. Can easily change it, so looking for suggestions as to a better place. Got to be closeish to the tube/Heathrow express so I can get to Heathrow relatively early. The Paddington Hilton is out of my league due to it being a higher award category.