So much to learn but this has been brilliant, thank all.
Update
Tested copper and 0
New amonia test 0
Re tested water to go in 1.026
Here's the kicker, I took the hint from a couple of posts on this thread. I havnt tested my water for salinity in tank as it didn't occur to me that what I was putting in wouldnt be the same reading. Everything I put jn has been good salinity readings so why wouldn't my tank be......
Easy answer because I top up with salt water not RO

Tested my tank and its sat at a lovely 1.50..... seriously such a school boy error I guess but I assume this is causing me all kind of issues?
I've done a big water change today 50%, tested half hour later and 1.040 so better but I guess this will take time, im ordering an RO unit as we speak should I remove a bit of water when I'm ready and top up with RO until the tank is stable?
Last kit to arrive is phosphate