Called Dev on a Sat afternoon and explained the issue with our boiler (i. E. No hot water on tap even though the radiator were hot and working fine). After asking for the boiler make and model details he said he would pop around on Monday. Monday came. Advice was provide on the issue with the boiler and pro/cons on a replacement diverter value. Boiler was fixed and work completed to a high standard. He left our kitchen clean and tidy. We will continue to use Dev as our go to plumber. Knowledgeable, experienced (this didn’t look like an easy job), honest with excellent prices. Recommended.