I find jubilee clips useless on smaller diameter pipes, they tend to bunch the pipe up and cause more leaks than they solve. Instead I use a tool I made myself as a copy of a semi- commercial item. It uses pieces of iron wire doubled up to form a loop around the pipe, the gadget then pushes on the looped end, whilst pulling on the two open ends to tighten it, before folding it over to lock it in place.
A similar idea to this -
I use the galvanised wire from armoured cable armouring.
Think it's time to sell/ give way for a Mountfield or something else