I have been passed on a job by a mate. A worcester 35cdi standard efficiency about 10 years old needs a new expansion vessel. He says its the one with the cylindrical shape vessel at the front down the bottom of the boiler, ( i think there is another version with a flat round vessel at the back down the bottom aswell ?? ) I cant for the life of me remember how easy these are to change and whats involved. Does anyone know roughly how long it will take? as I need to give the client a price. The job is too far for me to go and have a look to just give a price and the customer wont let work start without a fixed fee agreed.