Thanks to Julie Clark for photos.

and thanks to Selwyn Surgenor for updated information on lower set

This is Machynlleth again (mid/late 70s).
This can be confirmed by the distinctive town clock.
The shop is currently shown on google maps (SY20 8EB) as the Jobcentre.
The house next door in your 1965 pic has been cut in half and something modern (offices/flats?) added.