hi guys been suffering with water ingress in the tailgate, and it seems to hang in there until i open it, then it drains out, are there any drains in the tailgate that maybe blocked that i can check? i can't see anything obvious on there.

You want to be concerned how it's getting in rather than the drains. My guess would either be through the wiper seal or through the bottom edges of the glass itself. Sometimes the bonding fails and you get ingress that way.

I've replaced the wiper seal, around 18 months ago and that looks fine, it's draining from both sides so my guess is it's getting in both sides, my only other thoughts are now as you say bottom of rear window, or i have a fibreglass spoiler on the car which hasn't had the holes filled from the stock spoiler so also a possible ingress point. which i must remove it and address that at some point.

Spoiler would be my guess. My '98 spec spoiler was full of water - I had to seal it.

i have a fibreglass spoiler on mine, but the holes from the stock spoiler haven't been filled so a possible leak point

after having a quick look today i notice i have signs of water running down the back of the lower plastic boot trim, so a good chance it's rear window leaking