Do i have grounds to appeal on basis that I did not stay parked in the bus stop?
Unfortunately not, because the contravention is one of stopping, not parking.
However the bus stop is 30 yards long, enough for about 3 buses to stand, but there is only one sign by the sign for the bus stop itself. This is at the far end of the bus stop where the shelter is, and appeals have been won on the basis of inadequate notice of the restriction, because there is no sign for the restriction where you stopped. Against this argument is the presence of the broad yellow line and "Bus Stop" text on the carriageway, telling you this is a bus stop, although this on its own doesn't make it restricted.
This is the sign for the bus stop: -
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