From memory Avon G P is a rear fitment if you put it on the front I'd have to say it was self-inflicted!
At the time I was a naive 19 year old, I was sold a pair of GPs by Longstaffs at Woodford as an improvement on the old Avon SMs (Sado/Masochist?) I had bought the Vin from them so I thought I could trust them - in retrospect having seen the vin i should never have trusted them! Once I refitted the front tyre, getting it central on the rim it was fine.