top front wishbone bush siezed??

Creaking/snapping noise from top front wishbone bush area.Vibration can be clearly felt when raising suspension . Could the bush be seized or binding somehow??
The bush is rubber so what is binding in there?

Whats more should I drive the car to Brands for the Festival like this if I cant fix it in time?

Oh the joys of a 15 year old Lotus. :angry:

Clive - wishbone bushes are nylatron, so maybe a little silicon spray lubricant will sort it?