what i have done in the past was used Jessops to "test" and get the feel of products, sometimes bought stuff from them via reserve and collect on there site but only if its in the sale with 10% extra off the sale price
now i mainly use and would use the following again happily
one stop digital
mpbphotographic
7dayshop
my memory (awaitng goods i bought at the weekend)
and ebay - used them for monopod, tripod and bbits for my old camera, grip and what now and saved a fortune and the goods if bought from a reputable shop with plenty feedback is 99% of the time very reliable and trustworthy