In terms of experience of one of them, I bought off Maddox, but I would never sell back to them...or buy from them...ever. A Cans Festival poster and a sticker came with my VLH print, as part of the consignment. But, I only got the print. After months of continuous emails to then, a bloke from Maddox came up with line that the seller wanted to keep the poster as a 'souvenir.'Now that poster is fetching £2k plus. Forget the rising Banksy print; I won't forget that.
Hang Up sound quite good for 8% so they may be worth a shout.

Unimpressed by Maddox, no dealings with hang up. 

Anyone haggled the fees with hang-up, or is that a set rate?

Do Hang up charge 8%+VAT fee for consignment sales?

Enquire

Over £100,000

8%

for sales between £50,000 and £100,000

10%

for sales between £15,000 and £50,000

12.5%

for sales under £15,000

17.5%

for sales under £5,000

I have see above^^

you can always check out castle gallery ni. Andy is a good guy who always does right by both buyer and seller.

Very good experiences with Hang-up and also New Art Editions. Both recommended

Andy from castle Gallery for me ,bought and sold from him over the years .

I’d check results from Christie and Tate Ward sale

Depends on the prints, singed decent prints did well, unsigned crap bombed.