I have replaced the hose many times on 1100 and minis , which amounts to the same thing as on the Moggy. Undo the clips and cut off the hose, in the middle . ( You are not going to us it again !!) It can be a bit of a fiddle !!
You can use the corrugated type of hose part 10M228, or a bit of heater hose. To assemble--put the small clips on hose then ,either, compress the corrugated hose and fiddle both ens onto the two adaptors. The use of liquid soap is best !! If you use the straight hose tactic, the method is to bend the hose in half and wangle the ends onto the adaptors -- again fit the clips first ,but slide the clips to the end you fixed first , then slide them around to fit the other end -- replace the clips in the correct location + tighten up !! A bit of a fiddle to say the least !!
No doubt other members will have other ideas ? However, the above methods worked for me . Best of luck ( Ps. Do Not take of the head -- that's the last resort ! )

Arfron