Right, thanks for the response to the 'did the girl from Me and My Girl end up in porn' question chaps, but still no definative answer.
Having searched for Joanne Ridley on Google, and finding links to Hardcore celeb stuff, I reckon that Sarah Walker was the porn stage name for Joanne Ridley.
Hope that conclusion doesn't break any site rules etc, but Im now certain. If i find any links I'll let you know!!!