[v8volvo]

Yikes. Did you try checking in the wrecking yards? I don't know how common TD Volvos are over there.... on these shores going to a junkyard to look for one nowadays would be a hopeless undertaking, but maybe where you are the odds are a little better.

If you cannot find one used, before you order the expensive new part, there is one more thing that is worth trying... you can take both pieces of the broken line off the car and bring them to a hydraulics shop. Tell them you need a compression union that is the same size on both ends, and have them match the size to the OD of the broken pipe. If the place where the hose rubbed through is in a relatively straight section, and if there is room for the fitting to be there, then you should be able to clean up the cut edges and stitch the broken pieces together.

Hard to describe a compression fitting and how it works without a visual, but essentially it is a 2-sided piece with openings on both ends into fitting nuts, and inside the nuts there are little collapsible collars that we call "ferrules" on this side of the pond (not sure if you use the same name in the UK or not). The ferrule and the opening of the nut are precisely sized to the OD of the tubing being used. The piece of tube slips into the opening and then the nut is tightened, which deforms the ferrule in such a way that it crimps onto the piece of tube and makes a high pressure seal. Basically the same idea you tried to accomplish with the piece of rubber hose, except for using something that is capable of withstanding hydraulic pressures. I have used them for power steering systems before, guarantee it will do the job as long as you can find a good way to install it.

Fitting might not be dirt cheap, but should be much cheaper than the new hose, and more important, you could get one today rather than having the car disabled for two weeks...