Hi everyone I had a new felt roof 3 layers fitted 9 months ago, my boiler sits below the felt roof and used to have a rubber sleeve, when the new felt roof was fitted they put a felt collar on it not felt rubber sleeve, so now the flue is in a fixed place. I need to change my boiler and flue but cant as the flue is fixed, what are my options can i have a rubber collar sleeve fitted? would this mean peeling back the felt and damage?or could i just change the flue and put a new felt collar on ? any advice would be great thank you