If you order now you should get it tomorrow from Screwfix.
Failing that I would try a large B&Q or if you are really desperate buy the
cheapest drawer unit you can find and use one from that.
A kitchen shop in the high street may also have one knocking about they may
be willing to sell you.
Hettich make (and sell) them, I equipped all of our new kitchen
drawers with Hettich runners and they're excellent. They're mostly
rated for 30kg loading in the drawer and some go up to 50kg or more.
The ones that allow full withdrawal of the drawer have a special name
"full extension" I think.
Their web site is http://www.hettich.com/uk/index.html , it's a little
'idiosyncratic' shall we say, but there is a huge amount of useful
information there. They will supply direct with credit card payment.
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