Who do you recommend for UK Blackberry Exchange hosting?

Martin emailed me this morning with this question:

Who do you recommend for Blackberry Exchange hosting in the UK? There are plenty of suppliers advertising on Google, just, we’re not sure who to go with. Who do your readers use?

Martin, the only companies I’m aware of and have tried are American (e.g. Mailstreet and Intermedia). I found them reliable and responsive but I’m afraid I haven’t tried any UK Blackberry Exchange hosting companies myself.

Do you have any recommendations for Martin?