How old is my Wedgwood jug?

hello all

I found a Wedgwood jug, but im having trouble dating it. According to various sites you can date Wedgwood by one of the three letters on the base, however i dont know which to use, also some letters have been used more than once for different years which adds to my confusion.
A number 24, letters P & S, as well as another mark i cant work out are all on my jug. Ive found the same design in a few places however ages and value vary wildly, so trying to pin mine down is proving a bit tricky.
Approx 7” tall
Any help is appreciated

 

My understanding is that if a Wedgwood piece doesn't have the word "England" on the bottom, it dates from before 1891. I know what you mean about the changes in lettering and the confusing dates.

I know that @Ownedbybear knows a lot about Wedgwood, and there may be others... So, it's good to wait.