ISO gold and silver paper - NOT card

Papermilldirect has a gold pearlised paper which is really pretty and is 125gsm. 

I have gotten some gold, silver and white pearlized cardstock at Michaels. It also diecuts very nicely if you use it for that too.

I have gotten it in individual sheets, I did a search and it looks like this might be the same thing: www.michaels.com/shimmer-silver-and-champagne-8.5x11-cardstock-paper-by-recollections/10267497.html

If using the paper as a frame, cut out the middle of the paper- will cut down on some of the weight.

As you are in the UK check out lovefromlizi.com
She has a current kit that is all gold and silver and some is paper and some is vellum
Lovely and shiny and seems packed full

Tim Holtz has a metallic pad of paper that is actually pretty thin - but still cuts pretty easily.

Sorry - but I can't put my hands on the pad I have for information.  I looked at Amazon for an example and some information and the reviews there suggest it is "card stock" - the Amazon and Scrapbook.com descriptors also say "stock".  I have a scrap of what I *believe* is the Holtz metallic -- and it is thicker than I recalled.  When I was looking through my stash I also came across a scrap of Canford Gold (Daler Canford Paper)- which Mr. Google reports is available at Amazon and other places.  My scrap is definitely good copy-paper weight - descriptions on Amazon and Atlantis Art Materials suggest 32LB bond (but that is double sided and my sample is only metallic on one side)  or 120 gsm (at the UK art store and *looks* more like my scrap - which is a frosted gold, not so shiny as the Holtz piece).  The  bar code from my scrap  is 5 011385 93879 ... here is a link
Daler Canford Paper

cardstock-warehouse.com has it. I love that company - the customer service is terrific and their paper - and cardstock - is lovely. I bought gold and silver text weight paper - not cardstock - to make envelopes when I thought I would be making Christmas cards. (I couldn’t because I broke my arm and shoulder.)

The text weight gold and silver is 81 lb./120 gsm. (Printer paper generally is about 90-100 gsm and the cardstock warehouse paper does not feel heavier than higher quality printer paper to me - maybe just the barest bit? The drop down menu shows it in both cover weight (cardstock) and text weight.

www.cardstock-warehouse.com/collections/metallics-cardstock-paper/81-lb-text?sort_by=manual

They sell other things than paper and examples of cards and other paper crafts are shown with many of the papers. They’re on FB too.

Good luck - funny how one of the supposedly simplest supplies can give us the most grief. I only had a moment and didn’t read the other responses, so apologies if I’m repeating.