Ok so now I am confused by car - driving home the pad indicator started to flicker then came on. So knowing how these normally work braked gently just to check and light goes off! Drive another few miles same again.
Pads are Red Stuff so guess someone in past had them fitted they look at quick glance and feel that other pads are about 10mm face to backing plate - would have pulled wheels off but monsoon started any observations folks

Thanks