Well I got it all fitted yesterday while the sun shined and some pictures sre added. All of them will be in an album very soon.
With 20:20 hindsight I wouldn't buy a kit of eBay. All you need is a few meters of tubing, three 2 into one adaptors and a bunch of cable ties to do the job on a Td5. The axles already have push-fit connectors and the gearbox and transfer box have banjo unions with push fit off-takes.
Firstly I jet washed the underside at Tesco (Despite a sign stating 'No off road vehicles'), raised it on ramps with axle stands and chocks to assist. I also put on trousers with knee pads in them (I am old after all!). I then located the rear axle breather and removed the pipe. I fitted my new tube and routed it forward and up into the engine compartment. I did the same for the front axle.
Getting access to the gear and transfer box breathers was a bit more of a struggle. I took the transmission cover off which meant disconnecting the battery and moving the fuse box out of the way (but still connected). The transmission cover was an awkward job and it needed a lot of swearing before it came off. Many of the fasteners were corroded so they went straight into a tupperware tray with some corrosion stuff (LPS). The breathers on the Td5 have banjo unions so all I did was remove the pipes and fit new ones although I did disconnect the transfer linkage for access.
I now had four long vent tubes sticking up in the engine bay so after trimming the length they all fitted into the manifold mounted at the rear of the bay on the bulkhead. I then ran a single, larger diameter tube from the manifold out through a grommet sealed into the gap that already exists where the bonnet meets the bulkhead on the off-side. I routed the tube through two 'P' clips on the snorkel bracket and poked it into the top of the snorkel where it can breathe in peace.
The hardest part of the job was removing and refitting the transmission cover. The highlight ot the job was finding my flat cap under the cubby box!