Oh wow.
I have found crafty heaven and it is a trade…read morewarehouse in the Midlands.
This place has every arts supply and events decor piece your heart could possibly desire - sequinned ribbons to artificial peonies to bubble wrap to cards and invitations. Everything comes in 30 different colours and is bought wholesale, so you can buy in bulk if you so desire and also keeps it affordable.
We raided it for supplies for my sister's wedding - high quality paper and card for the table plan (home-made by my own fair hand!), a box of 50 wedding confetti pouches (such good value), 15 pretty jars and a tonne of coloured beads for centrepieces, artificial cherry blossom branches (they just fitted the theme), and a lifetime's supply of blu-tack. And that was only the first of several (awesome) trips.
Here's the big fat catch though - you can only get in if you're a business owner as it's officially aimed at trade buyers not amateur craft enthusiasts like me. In this case I had a useful aunt with a shop who registered for an account and brought us along. You still can't just wander in though - you need to show ID and leave any bags in lockers. And thus its existence has remained a closely guarded secret ;)
Looking forward to any excuse to get to go back!