I think you do need another garage because whilst ECU's are expensive - they're not £6k...
Whilst injectors can cause odd problem, so can failing batteries and alternators - and it usually starts with "ANTI SKID SERVICE REQUIRED".
But as has been said - get it into someone experienced - probably a friendly Volvo Indie. Often these electrical gremlins are something very simple and easy to fix - once it has been correctly diagnosed.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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