bio diesel update

Been running on 50/50 mix for a couple of days ,so far all ok .Went to indepentent LR parts dealer for fuel filter just in case ,so i asked for ther opinion .They have run 200 tdi on 50/50 just smoked a bit ,they no plenty with 300tdi who use it some 100% but a heater element that fits to fuel filter is adviced for colder starts costs around £60 .And the one fellow runs a TD5 on 50/50 mix .Thought id pass on there coments.
ta ra.