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One tip I can add is when piercing the hole remove the flaps that are left over. Either use a scalpel or a small round file by filling downwards only. Leaving the flaps can effect the sealing of the valve rubber bung.
Okay, so tyre now fitted. I discovered yesterday I'd ran out of co2 cartridges so had to get a couple. I didn't use fairy liquid this time, I usually do. I used a small round fine file to do the valve hole, worked pretty well and have removed all the excess tape. So, it didn't seat quite right the first time, but the co2 only gave me about 20psi, so an extra 15psi sorted it out. Now to leave it and see how it goes. Might go for a quick spin around the block later.
I've also ordered a pair of the Rimpact tubeless valves, they are due by the end of this week.
Final update, hopefully. Apologies, I know this is very boring.
Both wheels sorted and seem to be holding up. Replaced the valve in my Nukeproof wheel to one of the Rimpact type and haven't lost any pressure over the weekend so it was definitely the valve. Doesn't look to be any damage to the Nukeproof one, but either way it seems to be sorted now thankfully. Thanks for all the replies and advice.