Tonneau

Looking for a tonneau cover for my MGF. do the TF ones fit the 98 model, also whats a sensible price to be paying, there's loads on marketplace at around £40 is that good?

Should be
As AP mentioned, new tonneaus have silly prices

yeah i saw , will be going used route

If you can land a reasonable one at that price & spend an hour or so making it a great one, every time you fit it, it will remind you of what a canny lad you are.
Once done spend some time in sorting the fitting, it’s easy to chuck the thing on & press stud the thing down but you’ll be a bit miffed when it looks as well fitting as Queen Victoria's nickers
Roof clips down (as they should be when not holding the hood in place), make sure the hood is well down in its well, I locate the centre peg first & work out finishing with the door popers & then the boot, where tension can be adjusted.
This isn’t some old geezer telling some snotty kid how to do it, not that this is it the only way, indeed it might not be the proscribed way but mine had stayed in place & tidy having put it through the riggers of 30+ mph over what plod would normally let me get away with!
As it has been consistent for me, why shouldn’t I want the same for you.
M

many thanks for the advice 

An addendum.
Having talked about the tonneau & your other projects one of my pictures came to mind & it fits right between the eyes of these topics.
I turned up three turrets to go under the press stud & peg, these lift the poppers up by about half an inch. This allows easier popping on & unpopping & as it is around these that the material starts to split, these help. With this uplift you can get your fingers between the fabric & t-bar to lift the popper off, rather than pull it off.
It would take next to no time to print & In next to no time you have a lucrative side project.
Commission:
Shall we start at around 10% of the profit?
M

I'll do 15% if you do the marketing 

10% is a figure for a benevolent old geezer to sit & watch the commission roll in, if I’m expected to do some work, then you’ll be looking at a lot more than 15%.
M