Update: Thanks, Meego. I phoned Island 4x4 up and they said it was on back order. The new hose arrived and I was going to drive the Disco to my local mechanic. However, could not engage gear. Tried bleeding the system - no luck. Called the RAC and they tried bleeding the system. Air was getting in and bleeding was impossible. The RAC chap very kindly changed the pipe for me.
Took the old pipe to Pirtek who highlighted that it had been repaired before and when I compared the two, this was very true. The repair was obviously leaking for a long time. The pipe had been cut and reconnected. The ends were crimped on and this is where it was leaking from. I asked about creating a new pipe and the bottom line was it would be very fiddly and expensive, if it could be done. A suggestion was to get some Goodrich hose and put two ends on. This is becoming a concern. If this pipe is a weakness and landrover aren't producing them anymore, these could stop the Discos in their tracks. Having phoned a few salvage people, the pipes are hard to come by. I only hope mine will now last a few years.
Thank you all for your help. It was really appreciated.