For Ben, This type of connector is used extensively on hydraulics and also on air lines in garages etc.
If you look in your local yellow Pages you should find a number of companies listed under Hydraulic Engineers. These people will know the fittings you need, they can also supply you with hose if you need it.
I have the old system of gas regulators so I use these connectors on each of my regulators so I can change from butane to propane say, in just seconds.
With reference to the comments on jubilee clips, your local engineer will be able to fit the hose with crimped connectors for you