Sorry for the delay in replying. The line has been cleared for use ahead of a few gauging modifications needed at Moreton bridge, between Saundersfoot and Tenby, and Tenby station itself.
I was on the 1535 from Tenby on Saturday and passenger figures were reasonable for this time of year - the morning departure to Paddington is always the busier of the two trains.
Both return services on Saturday used HSTs▸ (High Speed Train).