yes that's great thanks. As you say I thought it would be trial and error, but I just wanted an idea of the pressure from someone who may have experimented already. It seems that 30 to 34 is what most sites quote for 165 R14 for a vehicle of this weight, so I tried 30 front and 32 rear today, and she seemed to motor a lot better with lighter steering which centered, no loss of traction and no wandering.
I hadn't realised that under pressurised tyres cause overheating, blowouts and aquaplaning. I'll keep an eye on the tyre wear