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No, I'd admit I should've tested thoroughly before carrying out said work, having worked on industrial systems in my previous life I should know better. My test gear is not at my house at present and due to isolating it was too much of a risk to go and retreive it. I carried out very basic tests...

I'm very confused, like you say it doesn't make sense - I'll do more investigating on the weekend

Okay, so update (for anyone who's interested!) Completed impedance test on ring (between N and E) and all okay. Took up bathroom floor!!! Disconnected spur (old radial) and connected ring as was.....cooker, vacuum etc still tripping RCD! I reconnected old radial as was and now everything...

I'll test the circuit tomorrow like you've suggested. If this is the case though, wouldn't it trip the RCD straight away and not just when a heavy load is applied?

No moisture or damp - the bath isn't directly over it but would need to come back out to lift the floor if you follow me. Not used the bath yet either as only just put it back in and siliconed it today. I can see the JB though the joists from the next room (about 2 metres away) and all looks sound.

Definitely nothing interfering with the cables - tongue and groove real wood floor only nailed at the edges (completely clear from the cable run).  I just can't get my head around what can possibly be happening now that wasn't happening before I joined the spur (radial), so I'm not sure what to...

I've disconnected the remainder of the radial cable back to the consumer unit and that breaker has been off since.

Tell me about it!! Do you have any ideas of where the issue could lie or things to try?

Stupidly I didn't test before going ahead as I made the assumption that as both were working as they should prior, and I had no other issues, that it wouldn't be a problem.  I've got a multimeter so tomorrow I'll start testing, but I really can't figure out what's causing the issue. I've...

I had a single double socket radial in the lounge and thought I would join it to the existing downstairs ring via a junction box hence making it a spur.  I identified the ring cable and cut it, rejoined it with a junction box and connected the existing cabling from the radial (leading to the...