Achnabreck

Achnabreck has the largest cup-and-ring mark in Scotland measuring 0.97m diameter over its seven rings. It is in the middle panel and is pictured here. In England, a similarly-sized carving is said to exist at Chatton – presumably this one and a larger one at around 1m (but nearer 1.2m prior to weathering) is at Gled Law (which I’ve not visited yet but it could be this one).
(Information from the PSAS 103 link below.)