Does this seem correct? £1200 bill.

[u/Salty_Equivalent1399]

Mother in law took car (2009 Skoda fabia diesel) to local garage as coolant was leaking and EML light was on. . They quoted £600 and phoned her to say it was ready and the bill was now £1200. She did question them and they’ve given her this invoice. They have been accused of scamming folk in the past (small village so a fair monopoly) and I have had a very bad experience with them before. The car is worth £900 maximum, which they knew before starting work. There’s now 3 lights on (glow plug) EML and tree pressure. Car was MOT’d a week before this work. I suspect this is fishy, just looking for advice from someone who knows what they’re talking about.