Don't forget Taunton station is currently being rebuilt back to front, so the down side will become the main entrance and the 28 will depart from the forecourt again.
I know, but meanwhile; no exit from the down side. Long detour required via lift and subway to the up side in order to then return via the main road, to find that the bus has left.
If this closure is unavoidable, then clear signage is needed, and a clearly defined new stopping point for the bus, together with checks to see if the bus does actually go to the new bus stop.
Some of the buses to Minehead seem to stop in the main road "outside the snooker club that was knocked down a few years ago" others stop by the now locked down side exit, and others leave from the up side.