Hi purly!
One of my favourite online shops is "Minerva crafts and fabrics" which can be found here:
http://www.minervacrafts.com/fabric-...emsperpage=200 I have found their customer service to be fantastic, and they are more than happy to email a photo of fabrics together if you are concerned that they won't quite go together. I had a quick look and they have a flat shipping rate of £5.99 for european orders. I believe their pricing is by the fat quarter, and usually around £3, so would be £12 per metre.
For more quirky fabrics, I like to use Fabric Rehab:
http://fabricrehab.co.uk they have a shipping rate of £7.50 for european orders. I actually live not far from this shop but have never managed to get there myself due to illness, but have ordered from it several times!
I also sometimes use Doughty's but haven't been overly impressed with their customer service (it's not terrible, I've just had better from Minerva!)
At a recent quilt show I came across "Lady Sew and Sew", who have a huuuuge warehouse filled to the brim with lovely fabrics (and quite a good selection of wide backing fabrics!!). However, I have not ordered online from them so am not sure how good their customer service is. I will definitely give them a go in the future!
Hope that gives you a good starting point :-)