Some good news - Car might not have HGF at all - been doing soem double checking and my bottom rad hose doesn't get hot.
Suggests either faulty thermostat or waterpump not up to the job - bits broken or not ale to flow enough when under full throttle.
Going to get that investigated first before we do any 'difficult' stuff.
Also getting my mid section replaced with a nice shiney 2.5" stainless wingy section, to complete my whole exhaust.
Also needs to have the rear right caliper checking as i think it is not sliding quite as it should and is binding a bit.
might be a nice quick and easy fix.... or it might still be a PITA