Just found this at my local Countrywide Farmers Store:
FUCHS Titan Truck Plus 15W40 Mineral Oil
API C1-4/SL
ACEA
E7, E5, E3, B3, A3,
For £16.50 per 5 litres
Phoned the company just to check and they said its good for TDi
Apparently "Silkolene" is one of this Companies Trade names!