‘61 Outback Glow plug problem cost

[Jantay53]

We’ve had Subarus -  Imprezas, Legacy and currently Outback - for over 30 years. Never had much trouble with them until the current 61 diesel Outback which recently displayed several warning lights on the dash. The garage we’ve always used (not a Subaru dealer)  checked it - on diagnostics they said - and decided it was just a warning light malfunction. The lights came back on just before we were due to go on holiday so we the left car with them. On our return garage says it was a glow plug failure and one broke as they tried to get it out. They’ve now had it 3 weeks and say it will be upwards of £1500 to repair. Does this seem reasonable? At this stage there’s nothing we can do except have it repaired but I’m now considering looking for a new regular garage as this seems OTT.

 Any recommendations in N Notts/Derbys area?