Here's the info on hoses available from DS.
30214793 Hose connector, small white, 20p
30673992 3 lengths, white hose, 150mm, £1.80
30808313 white hose 170mm, 20p
30808833 white hose, 115mm, 15p
30883690 white hose, 60cm 50p
30892072 35cm white hose, 35p
30892930 50cm white hose, 45p
30894680 150mm white hose, 20p
30898940 20cm white hose, 20p
As you can see, there seems little logic in prices at times.
The old style hose nozzle originally took solid hose, but it should be OK with the modern tubular hose or with one of the white connectors.
The white hose may need a connector to attach it to the fire hydrant as that, too, was designed for solid hose.
For your fire extinguishers, there is black hose, 30816420, 20p
