Safety certificate - Gas Work job in Hatfield, Hertfordshire

Job description

Hi, I have just accepted an offer on my home having put it up for sale. The seller is asking for a 'gas safety certificate' for peace of mind. So I'm looking for someone who is able to provide a safety certificate. My home is a small 2 bedroom terrace house. The main gas appliances are the boiler, cooker and gas fire. Is this possible? Property is in Hatfield Herts AL10