I got one off ebay and it worked very well and cheap.

Question of chinese or british might be addressed by comparing the quality (not the price). Cheap chinese might be poor value for money, but more-expensive chinese might well compare favourably with british but still at lower cost. Are you sure the ‘british’ ones are actually made in the UK?

If the epay quality is as much hit or miss as the likes of bang good, try by all means – but only if you can afford to throw the item away if it is sub-standard.

I’ve compared cheap chinese dies with second-use UK manufacture. Uk manufacture wins hands down when doing a tough job. I’ve compared chinesium bang good carp with UK sourced better quality chinese manufactured items and the UK sourced chinese item wins hands down. Your choice entirely.

Have to admit i do use the HSS chinese dovetail cutters at least a couple of days a week pro.

If its £10 delivered it must be something like 18 or 20mm theyre good on 6082 and will do well in excess of 40 metres as a general guide.
Equally use the 3/8"/10mm a lot, same again 10's of metres.

Just chop out or slot out material first and use cutter purely to cut the dovetail/s to size.

I bought a 10mm dovetail cutter for telescopic sight rail in mild steel. Suprised it did the job but took very light cuts

I made one, based on the Randy Richard's design he has a channel on YouTube.

It works brilliantly and uses a 60 degree carbide lathe tool insert.

Check out his channel

Richard