Nice one Richard. Best practice is using a fresh super sharp blade, is to very very carefully cut them to the bone from the bulkhead forwards, and thus split them to sufficientluy NOT disturb the pipes. When fitting the new ones, use slippy stuff eg gasket seal and very very very gingerly reapply the circlips.
After which have an epic roll and haggis with Lorne sausidge & a Tetley tea.
I believe the problem with jubilee clips is they tend to go oval when being tightened but the oem clips are better at maintaining even pressure around the hose.