Just to reiterate... If anyone is suffering this phenomenon, just quickly check (by looking down the filler neck) if any of the yellow anti fuel device is showing... If it is, try gently pushing it back with a long screwdriver... Worked on mine and it fills 100% perfectly now

Worth a check

Just checked my slow filling Westminster and yellow disc was down, now reset many thanks.
Paul Journey started in a LR2B at 16 and has incl. just about every Land Rover, Disco, RRS and Range Rover Vehicle owned or driven, I even worked for the company when it was owned by BAe - It must be a madness!!! because to add to my 4.4 TDV8 Westminister In Baltic Blue I bought a second L322 as a commuter bus, TD6 2004 Vogue in Oslo Blue with cream leather now both gone replaced with what could turn out to be my biggest mistake. Carpathian Grey ivory interior 3.0 tdv6 Autobiog. 2017

Aha! Saw the yellow thingy when struggling with mine today. Though I was being inept. Hunt the tool in daylight tomorrow then! 17 MY Corris Grey 4.4 VAB
Silver MB R231 SL350