Did not deliver when stated, do not answer the phone, and when finally came they carried out first a safety inspection of the route to the tank and the tank it's self then declared the tank cracked and refused to deliver until I had it replaced. My boiler inspector came and had a look and reports it's a small scratch, not of any concern. I'm now low on oil and having to make an emergency order from another company. The Certas delivery driver also arrives and puts on a white hard hat, safety glasses, and florescent coat, how is anything in a standard English open garden in requirement of such over the top safety equipment. Useless company, unreliable, keep clear. Totally engrossed in health and safety at the cost of providing any sort of reliable service. If you want to use them, be prepared to be let down. If you're using one of the online comparison / oil supply sites such as Boilerjuice, The Heating Oil Club, Fuel Fighter, or Chepest Oil to name a few, you can call them and have Certas removed from the list of suppliers, I highly recommend you do this. I’ll also add here if you are thinking of using the sites homefuelsdirect or heatingoil this is also Certas, again avoid.