In reply to carrot_boy (North East Wales MC):
I'd recommend a Specialized Allez. There are plenty of bikes around at that kind of price though, so try a few to see what you like. Entry level road bikes often have a slightly more relaxed geometry, based on the assumption that people who want to ride fast will buy a more expensive bike. The Allez is one of the better exceptions to this. Trek is probably also worth a look (I'm not sure what there current entry level bike is called at the moment as I think they've changed it a few times, 1.1 or 1000 or something like that). A lot of people seem to like Ribbles. I've never done much distance on one but I really don't get on with the way they ride. Also they look a bit too good on paper, suggesting that they save money on the frames to put better components on, though this may or may not be an issue for you. My advice is probably a little out of date as I haven't kept up with what's available for the past few years.
Most people (including myself to an extent) will just recommend whatever bike they have (if they like it) or the best of the small range that they will have ridden, so take all opinions with a pinch of salt. The most important thing is how the bike feels to you, so make sure you get a test ride, even if its just a few minutes round a car park (though the longer the better).
Accessories wise, you've already listed some of the most important ones. As nniff said, a track pump is a worthwhile investment and helps to keep your tyres up to pressure. A CO2 cartridge is useful if being late for work is an issue when you get the inevitable punctures, as is a couple of spare tubes (repair them when you get home). I'd recommend some decent clothing, especially during winter when motivation to ride might be low. A decent soft or hardshell jacket and some good tights or waterproof trouser depending on what you prefer would make the ride a little more bearable. Gloves are also essential during colder weather. Given that summer is technically on the way, these could possibly wait. Some kind of jersey or baselayer typed top will be better than a cotton t-shirt, though be careful not to make your workplace stink of sweaty cloths! If you're likely to wear it, then a helmet is a must.
Check with your scheme if there are any limitations on which shops you can use, as some specify a particular chain, often Evans or Halfords (though Halfords generally obtain the bike from a better bike shop). If you can choose, then go for one that has good customer service. The staff should take some time to recommend a bike and accessories, order the bike if they don't have it (though it's not unusual to ask for a refundable deposit to deter time wasters) and allow a test ride.