The Royal (Tv) Series

[Harleyj]

The Royal Series 5, episode 7- love is all you need.
Who sang the lyrics:
so she was just a one time thing, to lay a while and then to rise when the sun was new

[Buenchico]

I've not seen the programme, and IMDb doesn't provide any clues, but could it be be Michael Chapman's original recording of 'One Time Thing'?