Welcome Flynny.
You will find a FH if you just remain patient - as other said they do come along every now and then - pretty cool game  
WH20's are for sale more readily - but often in VERY average condition and they take a bit of cash to 'get nice' again.

I know the impatience of this hobby and I can see you grabbing a WH20 because you wont see a FH for sale......then after you outlay your cash on WH20, along will come 3 or 4 FH's for sale ......and then you grab that too.....and your HOOKED  

Sounds like you're talking from experience  

Taxi may persuade me to jump the gun, but I don't know if WH20 would, may need to clock up a few more games.  Pretty content to wait it out, but patience is not virtue I'm known for