OK, update! I couldn't stand the wait and amount of 'net research I was doing, so I went into a few bike shops this afternoon.
Thanks for the heads-up about Merida. I tried the
S'Presso 100, the
Speeder S2 and the
Crossway 20. Nice bikes, all of them. The frame finish is good and the quality of parts is good, too. The Crossway is a long way towards a mountain bike and I realised I wanted something a bit speedier.
Then Giant and the
Escape 2 City. Well, they're the biggest bike manufacturers for a reason and the bike was well put together at a good price (I haggled with everyone but they were the most flexible).
Then Trek and the
7.2 FX. I have to admit to owning a Trek already, but this one felt fantastic. Snappy steering, lightweight, slick gear change. Really good.
Finally the
Specialized Sirrus - in my eyes, the best looking and best finished bike of the lot. Nice to ride, lightweight so quick off the mark and really easy to flick through narrow lanes and around obstructions.
So... very little to choose between them all so I had to pick the one that fitted me best. I'd have been happy with at least 3 of these bikes as they all share the same (or very similar) gear sets, brakes, alloy parts and also geometry: The Sirrus, the Trek and the Speeder. It came down to personal choice and I went for the Trek 7.2 with money off and free mudguards!!
Thanks again for all the help.