varesecrazy said:

Hi

The rear exhaust silencer is made of several layers of steel

Over time.. these can peel like an onion..

They can look scruffy.. but still not leak

Howver IF the exhaust has any leaks.. that can make running poor

Click to expand...

You were right, it’s just some minor rusting.

Which end of London..?

The One radiator fan runs at different speeds.. triggered by different things

Getting it plugged into proper software can test all of this stuff from the drivers seat

And may well highlight what is causing the rough running

(Was this all one place doing the tests?)