Big Busted Ladies - Preferable UK

It is very tough buying larger cup sizes in the UK, most high street stores stock up to a D cup or DD if you're lucky so we don't have the cheap options of going to Primark, New Look etc.
I am the same cup size as you and tend to rely on Marks & Spencer as they tend to be pretty and consistent fit, always important to get measured though, especially if losing weight aa I find it often goes from my bust first
Debenhams and BHS also go up to that size but can be a little plain for my taste. There are brands such Curvy Kate for larger busts, many retailers stock and can be found online. Anne Summers do stock larger cup sizes, but I find them a little over priced.
I saw an article on the Daily Mail website recently that compared bra's for the larger bust - don't think I can post it but worth searching as it had some other suggestions.
Tough being a G cup, I recently went into La Senza and they had some beautiful stuff but they don't go up to a G.
Finally, but probably most importantly, please do go to the doctors about the pains, just to be sure!

Boux Avenue is the new La Senza.

Ahh, had no idea it had changed name - missed that one! Do you know if they are now stocking G cup?