Good value Hotel in central London?

[sniff petrol]

Planning a special weekend away for the first weekend in March for the GF and I for her birthday. Just had a quick google but most of the hotels are coming in at £100+ with breakfast. Last time we stayed at the City/Barbican as it appeared good value but by the time we'd payed for a few cabs I don't think we'd made any saving. Can anyone suggest anywhere they'd recommend?

[sniff petrol]

ThatPhilBrettGuy said:

Any area you'd like to be near?

Tottenham Court Road ish would be nice, or anywhere up West especially if they have parking there or nearby (planning on dumping the car and not using it once we get there)

[sniff petrol]

Many thanks for all your help, I've booked at the Imperial Tavistock.