Hi I noticed a small leak from the condensate pipe of my Worcester Greenstar 30Si combi boiler recently and called an engineer out to look at it and service the boiler. It was working fine and no leaks from elsewhere. He told me it was from a degraded seal between the inside part of the pipe and where it goes out through the wall to join the outside pipe and put glue on it to fix. He then serviced the boiler. When I came home later in the say, there was a large wet patch under the body of the boiler itself and having put a pot under this, it has since collected about 2 CMS of water, . I heard it gush water briefly once. I've contacted him but am wondering whether I should let him back at it; he talked loads about what he was doing and why but now I wonder if he really knew what he was doing. Appreciate any advice .