Any Plumbers doing loads of 110mm soil vent pipes etc, get yourself down to Lidl the shopping emporium & purchase the oil filter removing tool. First class tool for removing/fitting soil pipes;
http://www.lidl.co.uk/en/our-offers-2491.htm?id=740
http://www.lidl.co.uk/en/our-offers-2491.htm?id=740
