Further to previous post. I started to try and find an oil separator online from Euro car parts GSF etc. Second hand ones on fleabay for about £25, generic parts from China about the same price, Febi have one listed (49469) but no supplier local to me and they don't deal direct with the public so I bit the bullet and phoned the main stealer and was pleasantly surprised to find the genuine article is just over £30 inc. the VAT. Ordered yesterday and will pick up later today.