Thank you everyone for all your comments and suggestions. We will give them all a go!
She does seem to reach temperature, normal journey is roughly 30/40 mins and top speed reached is 40mph 😂
She needs a few body work bits done too, but shes a work in progress.
She was left sat for 3 years in my front garden as a garage told me she was knackered and would cost me a fortune to fix, even though I wanted to, they didn't seem to think it was a good idea! We checked the oil and it was all clear from any custard/cottage cheese substances.
I am her second owner, can't believe I have owned her 16 years! I don't feel old enough!!