Check out "Where - London" magazine from your hotel: Where
See also: Touring UK web sites.

Here are some accommodation options worth considering (1999) -

Millenium Hotel, Gloucester Station, Kensington
Great location, very nice rooms and good rates for the area.
Pricing 1999: £94/night (room only) for a double with crew discount.
Phn: 0171 373-0409, web: www.mill-cop.com

Copthorne Tara, Scarsdale Place, Kensington
Good rooms in a great location - widely used crew Hotel
Phn: 0171 937-7211,  Fax: 0171 937-8329

Cumberland Hotel, Oxford St, Marble Arch
Great location in central London... rooms are very small but you can negotiate an executive room on 1st floor when off-peak. Renowned Carvery.
Pricing 1999:  £84/night B & B for a double on crew discount.
Phn: 0171 723-2036

Adare Hotel, Paddington Station area - near Hyde Park
Very nice B & B at £58/night for a double
Phn: 0171 262-0633

Sheraton Skyline Heathrow
Very nice executive rooms £80/night (room only) for a double.
There is also another Sheraton at Heathrow: Heathrow Hotel... definitely worth a try.

Car Hire
National offer a weekend rate from Fri to Mon at £61 for a 1.6 litre car. This is a good deal with airport pick up included.