I'd erroneously referred to the above as being the Idwal slabs but have been corrected by one helpful viewer, who identifies the above as Tryfan Bychan (see comment below for further informaton). Cwm Idwal offers many a climber a decent weekend break (no pun intended).
Slabs, by the way, are the product of glacial movement and erosion exposing bedding planes...and they cry out to be climbed, which is something I've not yet done...