OK I've made an order for a fuel filter WJN101250 or GFE7036 which is the unipart code for the rover original may be a tenner well spent I'll come back with my findings, put some Esso Super unleaded in the tank today appears to have improved her performance. Us plus 4 T16 folk need to stick together and support these cars, Talk Morgan is a good forum for this.

Morgans 1934 MX, 1947 Series 1, 1956 +4 TR4, 2000 +4 T16
Triumph Herald 1969 13/60
Morris 1970