Broken down Roomster. Good local garages near Peasedown St John and Radstock

Hello, I recently bought a Skoda Roomster 1.6 TDI CR105 SE. I’ve only owned it for a couple of week but unfortunately it’s already broken down. Everything worked great on the test drive and it felt like a genuine good buy but over the last few weeks the car started to idle a bit rough and the engine would also cut out occasionally. At first just in low gears when starting off if I didn’t keep the revs up and later even cut out a few times at higher speeds with no warning or error lights. Previously it was possible to restart the engine straight away but yesterday it cut out again and wouldn’t restart event after being left to cool and disconnecting the battery. This time the the glow plug light is flashing. I’ve just moved to Woodborough Hill near Peasedown St John. Any tips or recommendations for good honest local garages would be much appreciated. Can’t really afford main dealer prices. Thanks in advance, John  

Edited 26 May, 20179 yr by JTM78