@davidg wrote:
I’ll give K Seal or similar a try over the weekend. Fingers crossed it’ll save me a lot of hassle.
Not a very good idea. K Seal will make it more difficult to actually fix the problem when it fails to do the job. If the liner is leaking there must be movement and it will only get worse and end up damaging the block. You may get to see this if those that be allow it to be posted.