Well it looks like it lasted for about 1 year!
Decided to sell up this tank, too much maintenance along with the the other one, and my lad isn't as interested anymore. He was full of enthusiasm when we were visiting the lfs and deciding on the stocking.
He'd rather be adding more and more fish, but since its been full, and none of the fish have died, thats not an option!
Thanks for everyone's helpful and positive comments along the way.