If you want something in black, has only 7 speeds, and is full size (26"), take a look at the Dahon Jack. It seems to have everything you wanted in your ideal bike. Dahon takes care of it's customers and is gaining a stronghold in the UK. I own a black Boardwalk myself. Check out the 2 website they maintain:
http://www.dahon.com
here in the US and
http://www.dahon.co.uk
for all of you in the UK
Please let us know of your decision in this matter.