We then board the 1602 First Bristol, Bath and The West service 18 to Westbury-on-Trym (Westbury Village), arriving there at 1634 on Monday afternoon.
I'm sure Llangammarch (Wells) is a delightful place, so it's no great hardship to while away the four hours until the next ATW train at 1507. There appear to be no buses - ever
It takes us to mmm.... let's get off at Llanbister Road at 1601 Wednesday afternoon
I think the 48 bus from outside the Post Office at 12.43 would permit onward travel towards Bullth Wells within the two hour window
Traveline Cymru ... I do find it not overly user friendly