Horrendous. Sent the wrong type of engineer, without experience on an oil boiler. All that needed fixing was a two port value, subsequently broke entire system. Hung around for three hours whilst I was working, so the company attempted to charge my account AGAIN for the pleasure of breaking the system, despite me not signing out the job as completed. Absolutely fraudulent. My family is currently sitting in a cold house, waiting for another company on an emergency call out to fix it.