We're at risk of sounding like a load of old fogies reminiscing like this...
Anyway, had the alignment rechecked today at JPS Wheel Alignment in Milton Keynes as I work in MK and they could fit me in at lunch time. Unsurprisingly, the front toe was out and after correction all is good again.
The original garage have provided a refund and apologised profusely. Turns out they had the alignment gear calibration checked a couple of days ago and something was out of spec.
All's well that ends well as they say.
Small donation made to the forums by way of thanks for your time, Tony.