Once you have fish, you will want to get the temperatures matched better than that. During your fishless cycle it should not cause much problem. Now that your pH is back where it belongs, you should start to see ammonia processing properly again.
You guys are stars!
The ammonia is now down to 0 again after last nights top up. The only sad news is that Nitrite is back to 2 so I have a little longer to wait for the fishies.
Thanks again!