So went into my LBS and told him about my commute route. Really the only bike he recommended was the Specialized Crosstrail. I went for the Expert model (one down from the top of the range) at £750. It looks pretty good. The tyres are interesting. The middle part is slick, so should be good for roads, but it also has small knobbles as it curves up towards the sidewall. What do you all think? If I get it, it will be through the cycle to work scheme, so I'll save about 35% of the cost as it comes out pre income tax.