The Disco has started to make a hell of a noise under acceleration, it's roaring like when the engine is turning a cold viscous fan but it's warmed up. I have been to Langley Farm today and went through a very deep gloopy 'mud hole' 3 times so I'm wondering if
a. I've sucked mud into the air filter (No snorkel yet :( ) and it's struggling
b. I've got a seized fan
Any ideas?