Hi Bertl and Rich,
Wow - and I thought I had an eye for detail.
Yes you are both correct.
The kit supplies two tail planes and yes - I fitted the wrong version with a slight curve to the leading edge

Well done guys as obviously I hadn't realized.
It's only a slight curve so I should be able to sand it out.
If necessary I'll have to replace the decals.
Thanks for spotting that guys,
Mike