I must say though, the dive system worked, even if it dumped all its pressurized air to atmosphere. The reversible pump still vented the tank and the sub surfaced and dived, very stern heavy though. Such is life.
So, I have spent the last couple of days improving the pipe seals, replacing T-Connectors with better ones, and re-enforcing the end of my ballast tank. This I have done with a mix of 50 year old US of A medical gauze, Z-Poxy and epoxy thickener, rather like plastering a broken leg, only this hopefully wont be coming off in six weeks!