Hi Jayne,
Jersey has issued revenue stamps with £100 face values.
Here's an example from my own collection:

This stamp has a "specimen" overprint which I expect in this case reduces its value significantly.
However, if your stamps have been used and, most importantly, are in good (i.e. "very fine") condition, there may be collectors who would be very interested.
These stamps are listed in my very old Barefoot "Great Britain Revenue" catalogue but this is much too old to give meaningful prices.