I'm back home now, recovery is worth its wait in gold owning an MG!
On closer inspection, it could be a pipe to the rear of the engine, quite difficult to tell at night though. I'd planned to get everything checked over by my local garage anyway so it's no problem. Just one of those things
I knew something would happen, 2 bumps in the MG3 last week and things come in threes!
Temp gauge didn't rise so hopefully no damage to the engine. Fingers crossed