Advice on MGF 'T' reg

[gshock]

Hi.
My wife's MGF gave up the ghost last week. There was a noise coming from the engine behind her and then the car was loosing power in all gears. It seems that no power was being delivered. I have the car with a small garage in Flitwick who I dont think know what they are doing. They have checked Cam Belt, Fuel valves, Diaphram and have sent off for an ECU test but it has come back all clear.
Does anyone have any other ideas for me.

Thanks so much

Giles.

[gshock]

Thank you so much Jonhmac.
Im not very clued up on MGs, but this is great advice.
Many thanks

Giles.