LowNSlow
Having had a look at the tank the corrosion is not as widespread as I'd been lead to believe, but bad enough. The tank itself is a nightmare of baffles, braces and bits and to make things even more difficult it looks as if it was riveted together and then the joints sweated with solder to seal them. However we have found a place that can carry out the repairs and hopefully by now the tank is with them so progress is being made.