@deltarider
Well the known brand are more expensive and I asked DS about theirs and they couldn't tell me the resistance. So I checked with Ash, and he said go for these as the resistance is documented and correct for the bike.
Thanks for your advice and feedback, I get where you are coming from, I am also wary of cheap parts especially on the Wild West which is Ebay! However on this occasion, these coils are from Hendler, a UK based company, and supplied to the company I purchased them from, also based in UK, direct link below:
https://www.hendler.co.uk/product/hendler-ignition-coil-12v-points-twin-lead-2-wires-90mm-centres-p-511oh-s-1755koh-540612hSounds like you had a bad experience in the past, but alas it makes no difference to me if these were made in UK or PRC, especially as I already have them and they work fine!
Time will tell