Gas boiler repair recommendation please - Rathfarnham South Dublin

Hello

I am looking for the contact details of a reputable gas boiler repair man in Rathfarnham South Dublin, I know the default is to contact Bord Gais, but I had it BG serviced in summer 08 and literally the BG guy spent 15 mins vacuuming the boiler case and charged over 100 euro - did not inspire me.

It is an Ideal Classic System - wall mounted fanned flue - 10 years old

The boiler starts up each time with a decent blue flame and I hear the pump running but after 30 secs or so, it cuts out and stays off for 15 mins or so and then restarts again and so on for 30 secs - eventually after doing this 3/4 times - I hear a hissing sound (expansion tank?) and its cuts off asap. I then turn it off for fear of damaging any thing. The pipe leading from the boiler to the pump on top is hot and pipe hot aferwards into the wall - storage tank upstairs is lukewarm only - all radiators cold

The boiler worked reliably before the summer (but was off last 3 months)

Any idea what is wrong / repairer recommendations / likely costs

thanks in advance

try this guy his name is john and he lives in dundrum 0872439035