struggling to choose matching bridal and engagement rings- help!?

I have a nice design which my fiancee likes, but have no luck finding similar designs online available in the UK. Also I have no idea whether a matching wedding band is available. The engagement ring she likes is a princess style, trilogy, with side bands of diamonds, in white gold or platinum. I don’t have a huge budget, but need someone with experience & taste to point me in the right direction where to look… at short notice!

http://www.chapelle.co.uk/Diamond-Rings/Trilogy/White-Gold/247.html

http://www.chapelle.co.uk/Diamond-Rings/Trilogy/White-Gold/27440.html

http://www.chapelle.co.uk/Diamond-Rings/Trilogy/White-Gold/27438.html

Matching band -

http://www.chapelle.co.uk/jewellery/Diamond/482.html

http://www.chapelle.co.uk/jewellery/Diamond/36706.html

The band to match depends upon how it fits up next to the engagement ring – sometimes it’s good to buy a set.

Diamond Engagement Bridal
Diamond Engagement Bridal
Diamond Engagement Bridal