W-1 Drill rod and UK

Several years ago I brought plans for a hobby CNC machine from
www.hobbycnc.com. I am now semi-retired so hope I can find the time
to complete the project. I managed to find somebody to mill the
leadscrews for me. But I am now stuck getting hold of W-1 Drill Rod.
I tried Metal Supermarkets in Southampton but they say they don't
know what W-1 Drill rod is other than its an American Specification.
I don't want to have to order in the states and get shipped over if I
can help it. So does somebody know what the equivalent of W-1 Drill
rod is in UK speak.

Anyboby built a hobbycnc machine in the UK.

Thanks Keith