Managed to sort it but if you can pass this information on to a dev that would be great.
I use an ethernet cable on my motherboard, which is an Asus Rampage 6. I had it out and all the cable out recently to the game issue. Gave me an idea and i took the ethernet out the aquantia 10G port (which runs internet and joins servers fine on every other game I play) and plugged into the Intel I219-V Ethernet port. Possibly it was in the intel one first and i mixed it up when i came to put my pc back and connect it back up again.
Now it connects to servers and games just fine. No change to internet speed as mine is only around 50mb/s anyway.
Unsure why this would cause an issue, possibly a dev can update the game to support this? im not sure.
Thanks for the help anyway :). I can finally play again!