We live just to the West of London.
http://www.pimlicoplumbers.com/
A mate used these guys - have a read and see how you feel.
http://www.firedearth.com/47_202.htm at the Adderbury head office they used to have an end of range, ex display and seconds section open to the public at very resonable prices ( I have just phoned to check and it's still there! ) So if you ever go to Bicester Village to shop it is a smallish detour while you are out that way.
For an upmarket look you can use a lower budget white tile with an upmarket border. Haggle for a job lot at your dicount tile store managers special etc. Remind them if these cheap tiles are out of their way -they can put something flasher in the floorspace if you take the lot - put the spares under the bath, If you redesign or damage a tile spares to hand without an expensive complete re tile!
Unless you have a plumber in the family do not go for cheap taps - false economy in my view. Find what you want on the internet then go to plumbers merchant locally to see if they can match price for similar or better quality. Look at thickness of bath CAREFULLY some are shockingly thin and would flex too much imho. If you tile yourself fill bath with water before mastic-ing edge of bath and tiles, avoids that split look.We pay 200 quid a day for our tiler he works 9 til 6 is fast and acurate - as a guide to compare. Hope this gives you a few ideas. Buy a copy of the ' Money Pit' as you may need a laugh mid projects!!!!!