Gas Boiler Service - South Dublin

Can anyone recommend an RGI that does a proper job of servicing a gas boiler in south Dublin?

Last time I used Bord Gais and wasn't happy with the 20min job. It seemed like just a rush to check the legal reqs. quick run of the hover and lash out the cert. Can't blame the guy doing it now that I know they are contracted and paid a very small amount per job.

A few days later the boiler stopped working and the same lad was back to replace the venturis which were crumbling... surely that should have been picked up on the service? There was no charge for the labor but the replacement venturis were priced pretty highly.

I did search, but didn't find much in terms of solid recommendations.

Thanks.