Welcome,
£5k is plenty to buy you a nicely sorted Z4 E85.... especially at this time of year.
Don’t rule out a 2.5si (218bhp) facelift car (not to be confused with the 2.5i) . Real world performance isn’t that different to the 3.0i and 3.0Si (Facelift)
However you look at it, you’re likely to be buying an old car, so if you’re not sure what to look for try and take someone with you.
Take into account what the car has had done, and adjust your price accordingly..... but don’t pay over the odds just because someone is trying to recoup their spend. Some cars listed here are listed at very fair asking prices but others get listed at prices you’d be mad to pay.
The Z4 is not a classic car (yet), so don’t think of it as an investment... just as fun!
Biggest tip I can give you is.... take your time, It’s a buyers market so if you’re patient you might just find a gem