Gas First is part of CTS Group [Gas Safe registration No. 229998] 
Gas Safe Register is the official list of gas engineers who are qualified to work safely and legally on gas appliances. CTS Group have 15 gas safe registered engineers and encourage everyone to always check that their engineer is on the gas safe register. 
Gas First is based in Kingswinford and is centrally located to service domestic gas boilers in Dudley, Stourbridge, Brierley Hill and the surrounding areas. It also has a base in Wolverhampton. The special offer is only available to customers who live in either a DY or WV postcode. 
What is the difference between a gas safety check and a boiler service? 
A gas safety check is a basic, but potentially life saving check to ensure that your boiler is safe for continued use. A service on the other hand, whilst including a safety check, is more comprehensive with more work done [more checks, more parts removed and cleaned]. There are two other noticeable differences: A gas safety check is often carried out in about 30 minutes and costs about £60 on average [source: gas safe register] whereas a service takes an hour or more and costs about £90. 
Gas First do not offer basic safety checks preferring to offer their customers more comprehensive boiler servicing, at £78, discounted to £39 for DY and WV postcodes. This is a limited time offer, however if you are not ready for your annual service we will honour all bookings made prior to the offer being withdrawn. 
"It’s vital that everyone has their gas appliances regularly serviced and safety checked every year." 
source: gas safe register 
"More than 5.5 million people in the UK are putting their health and finances at risk by not getting their gas appliances safety checked every year – which, according to a new survey among gas engineers costs, as little as £60." 
source: gas safe register