Boulder of the Month (now defunct, or perhaps taking a rest/opportunity to stock up on fresh finds) was often, quite unreasonably, treated with ridicule or open disdain. Truth is that in amongst the cosmic jokes and blatant blags Big G hid some gems. Remember, this is the man who tipped off yours truly about Porth Ysgo back in the late '90s!
Anyway, it turns out that the Ghost Cave at Trearddur Bay has a classic 7A test piece, plus a supporting cast of quality lines. Initial serious exploration came from Lee Williams and Dan 'Bruce' Roberts, who picked off many of the more obvious grade 6 lines. Phil Targett was the man who subsequently took it upon himself to take a closer look and was richly rewarded for his curiosity, particularly when he bagged the first ascent of Screwball Scramble, the 7A traverse of the left side of the tidal cave. Matt Powell also got involved and between them further development of this fine feature occurred.
Approach: from Trearddur Bay on the B5445, drive up Lon Isallt road with the football pitch on your right. Park considerately on the layby at the first large cove before the 'ghost house'. Walk around the rocky headland from the beach. This is very easy and takes about 10 minutes. Do not walk along the grassy headland as this is understood to be private property.