The ends of the hose are usually ok - just a little surface rust. Its that union that's the problem.
As I have mentioned before, the first half of the hose is non-trivial. It has an inner liner which is supported by a crimped bush halfway along it and then supported at the end by the rusty union. In theory it would be possible to replace the hoses and insert this same support bush, and then put a crimped hose joiner where the rusty union is to support the end of the liner. That kind of creative thinking is waaay beyond the monkeys at your average Pirtek though
If you can find someone who is willing to work on this then I can bring my spare set up to Leeds. A plain 10mm hose doesn't work btw - the pump howls constantly.