OK.... So i gather i have 2 options.
Rusty's uncle advice is run with 155-65-13 without any spacers
Or
Run with the maximum tyre size, which Pete126 says is 165-55-13 but will need 5mm spacers at the rear (no feedback about the fronts)
I'll try and source tyres from my tyre man and feedback ...... Thanks all for the input, really appreciate it.