HI Ads,
I got the kit from Euro Car PArts. By ordering through Stuart at the leeds branch I got a 10% discount for being a member of this ere forum. Total cost about £187. This included shocks and springs.
Depending on the age and condition of your car you might want to consider changing the top rubbers at the same time. I only changed my fronts but at £12 a side not really that expensive.
Hope this helps,
Nick