Thanks all for your replies.
I'm gonna' spend another couple of days trying to press out the bow, hopefully that should see to it, but if not then I'll work it down to as flat a surface as I can by sanding as the bow isn't extreme enough to go at it with the trusty plane.
The back is thickness ready so I'm good to go when happy with the top.
I just flicked through a couple of books for some advice and noticed that Melvyn Hiscock had a similar problem when building his Tele (although it only had a 1/4" top...page 108 if anyone's interested)
He jointed and glued the top to the back at the same time so this approach may pay-off if I can't reduce the bow any further.
The piece was originally 3" thick and I had 2" re-sawn, split and thicknessed. The bow appeared pretty much the day after. I can only summize that it was either originally stacked badly or not dried out enough.
I'll keep you posted on my efforts, this is hopefully going to result in a lovely carved top in the coming weeks.
Thanks again to all, your advice has been helpful and re-assuring.
Regards
ww