Just seen this. Yeah, local's venue. As in - if you live within 10min and don't mind very lowball lowballs, it's somewhere to potter around at. Shame you haven't got the guide - it would have warned you off!
Jumbles is likely to be midgey this time of year and probably not ideal for group bouldering.
The east lancs moors are good (Blackstone, stony edge, dove Lowe etc) just depends whether they are close enough for you and you are happy with longer walk ins.