Officers were called to Short Lane at around 6.20am after reports a woman had been assaulted next to the alley that leads to Masefield Way.
The suspect is described as White, in his early 40s, approximately 5’7”, of slim build, bald and it’s believed he had a foreign accent.
He was wearing a short black raincoat with long sleeves, black trousers, and black shoes.
Anyone with any information is urged to contact police on 101.