As most have mentioned you need to sort the gully out rather than tank the inside.
As it looks like the top section has been detached, why not remove this section, then check if the other section is crack free, if so just replace the top section you have removed.
the condensate pipe also needs extending to go into this gully, in cold temperatures there is a lot of water sent down this pipe from the boiler.
Think this Could be a straightforward repair really.
As it looks like the top section has been detached, why not remove this section, then check if the other section is crack free, if so just replace the top section you have removed.
the condensate pipe also needs extending to go into this gully, in cold temperatures there is a lot of water sent down this pipe from the boiler.
Think this Could be a straightforward repair really.