Thanks all for the replies and help. Only just got round to it as works been hectic! Took it back to the garage and they can't find a fault. I suspect they just took it round the block....
A few people have suggested the thermostat and new expansion cap. Any ideas how long a thermostat should take to change? I don't want to be mugged off again by the garage!
Time taken depends on if it breaks off flush with the block. 2 hours max I say worst case. £50 ish for the parts, last time I bought them anyway from Rimmer Bros.
Always worth noting the mileage when dropping a car off, a mate dropped his almost new RX8 off for an oil change, car did over 100 miles......he was into his technology and had trackers and a camera on the driver to identify the driver if stolen, it made an interesting conversation with the garage.
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Former custodian of the legend that was FE54 - RIP
I'd recommend getting a different garage to look at it or even if it cost the few pound extra get on of the MG specialist mobile mechanics to come out and look at it? Might be a bit more money but worth it for the piece of mind that it's been looked at by someone who knows these cars and doesn't have the "oh it's just an old Rover, they all overheat" mentality
Got in contact with MG Mobile mechanics but there is 4-5 week wait.
Annoyingly the heater is not working now, just an error code on the screen, so can't even run it with the heater on to keep the temp down. Ive washed it for the first time, so at least it looks good!
Also, there are no lights on there dash. The lights/indicators are working though. I doubt all the bulbs have blown overnight?
Just a fuse issue. Lights back on now.
Error code was L9, took it out and cleaned up, now working.
Anyway, she's for sale now if anyone is interested before she goes on eBay