Sasha G. on AW is a pretty decent option for a B&G. Offers OWO and CIM for £40 (15min) and £60 (30min) if I recall correctly. I last saw her just before the first lockdown in Hatfield; but I think she's only in Waltham Cross now.
Edit: Sorry I just remembered she's Romanian, my apologies. Not sure if you're strictly after Polish WGs.