Can you suggest a UK based RedHat hoster?

[sjr4x4]

Currently use the Planet (or now known as Softlayer) for our dedicated hosting, with many years of happy service and prompt support.

But they don't have any UK offerings. Can anyone recommend a UK dedicated hoster that matches The Planet for uptime, quality and value?

Have previously used UK Fast, and don't want to revisit that one.

Rackspace seem to be on a par, but like for like server spec and service is more than double the current cost. Before we go down this route, want to see if there any other realistic options, as cost is secondary, but Rackspace do seem overly expensive.

Have seen a couple such as vi.net and bytemark.co.uk which look promising, although bytemark doesn't seem to offer RedHat. Anyone had any experience of them?

We are looking at a heavy database driven site for a UK audience, and key aim is to reduce transaction times, as well as maintain current uptime record.

Any other serious suggestions gratefully received.