Philippa May was followed by a hooded assailant as she walked along St John's Road to her partners house before being shoved to the ground in a lane.
The suspect made a sexual threat before he fled with her rucksack containing two iPhones, leaving Ms May bloodied and bruised.
Investigating officer, Detective Constable Reda Imane, said: “I would like to appeal to members of the public that may have been travelling home from work or who live and work in the general area to come forward with any information that could assist this investigation.
“Somebody may have seen something which could prove an invaluable piece of information to catch the person responsible.”
Anyone with information that could assist the enquiry should either call DC Image or DS Andy Dawson on 07500102631 02082461552.
The police can also be contacted on the non-emergency line 101.
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