I could spend a fortune on lingerie from lovehoney!
Juan wrote:
Coco de mer and Agent Provocateur have some top end stuff - pricey - some classic stuff some avant garde stuff. I think Coco-de-mer als has a stella mccartney range.
Lovehoney is always worth trawling through - there are often some gems on here (sizing is often a bit more general than other places though - which is good f you aren't sure of exact sizes...not so good if you are after an exact fit) I love these: http://www.lovehoney.co.uk/product.cfm?p=26807 and http://www.lovehoney.co.uk/product.cfm?p=26355 http://www.lovehoney.co.uk/product.cfm?p=26202
For pretty stuff , well made, and affordable can't go far wrong with Adore Moi or Floozie from Debenhams.
Slightly harder to find and more pricey - Chantelle do some very chic stuff - the sheer africa range is v pretty and Aubade do a chic french range too
FlirtyorDirty.co.uk has a broad selection of pretty to erotic stuff from budget stuff like Anais to expensive stuff like Luxxa and Lola Luna.
Enjoy choosing ;-)
ahhhhh agent provaceteur 
. absolutely beautiful!!! Coco de mer though is just so ordinary, i could find more beautiful and sexy lingerie in next haha for £30 for double sets of bra and knickers haha.
there are some nice things on lovehoney, but i find that loads are sexy/tacky rather than sexy/beautiful...
i.e sexy/tacky - http://www.lovehoney.co.uk/product.cfm?p=21103
sexy/beautiful http://www.lovehoney.co.uk/product.cfm?p=25840 IF ONLY THEY HAD IT IN FRIGGIN GREEN
everything is also just all the same! - black or red and lacey with slight differences 
. everyone has personal choices though but for a PRESENT, you want it to look expensive so i would suggest browsing through john lewis and debenhams for top of the range stuff. la senza (since being taken over) has gone so horrible, http://www.lasenza.co.uk/matching-sets.html?p=1 but maybe ann summers? they do have lovely stuff, but so expensive! http://www.annsummers.com/p/frilly-ivory-corset/01srcras1035029 
Ann Summers have a set called Voyeur which I love, it has old fashioned style fabric, white and black, with little pictures of people having sexytimes on it! Victorian(?) threesomes and such. Trees etc. It's really cute. Too expensive for me though, sob. But affordable for a gift!! :)
http://www.victoriassecret.com/bras/bombshell/add-2-cups-multi-way-bra-bombshell?ProductID=87542&CatalogueType=OLS
A fave or...
http://www.marksandspencer.com/Rosie-Autograph-Pure-French-Designed-Teddy/dp/B00AEGQ0UE?ie=UTF8&ref=sr_1_7&nodeId=1837456031&sr=1-7&qid=1360524367&pf_rd_r=0X7H2TMCDVEZ7CE7XY95&pf_rd_m=A2BO0OYVBKIQJM&pf_rd_t=101&pf_rd_i=1837456031&pf_rd_p=321381387&pf_rd_s=related-items-3