Leaky Gas - TRANSCO or RGI needed first?

After a bit of advice please

I'm not sure who I should call in first on this one....... the situation....

I have a property that has been vacant and on the market for some time. Whilst I was out of the country some months back my estate agent accompanied a potential buyer and their heating engineer to look at the place.

The engineer detected a leak somewhere around the meter and capped the supply (good! ).

Thing is I can't make contact with the buyer or engineer in question so I don't know if they know where exactly the leak was.

Should I get Transco or an RGI in to sort it?

TIA
Graham

if its been capped off then a RGI is need to trace and repair

OK. Thanks.

Anyone recommend an RGI in the Maidenhead area? Also looking to get the current vented CH system ripped out and replaced with a combi if anyone has time this side of xmas

Cheers
Graham

Thanks

No adverts in my area..... guess it's Yellow Pages then.