During WWII notes with a denomination of �100 and over were discontinued and withdrawn to combat counterfeiting.
The �1000 was withdrawn 30th April 1945 however it was introduced in 1725.
As time progressed smaller denomination notes were introduced for circulation e.g. �10 in 1759 and �5 in 1793. This is what led me to thinking (erroneously) that it would be �100 because of the later date (1752) which I now put down to a typo.