In reply to zigzag:
Hi zigzag, giltar slabs will sometimes be closed midweek if they are firing at penally. You can't find out the firing programme this far in advance.
Giltar should be open every weekend and i think every evening, even if they are firing daytime midweek.
Becks point is only 500m west of there but is open all the time. As are the lydstep crags (mother Careys etc). I live about 3 miles away and could be up for getting out one day, I can't compete with your experience as I've only been climbing 30 years.
For low - mid grade climbing the crags near st David's are better and are never closed for firing, but they are about an hours drive from Tenby.