Succinctly sums up the situation i was in! Because the wipers still wiped and i'm used to the wiper and washers sharing a fuse, i assumed (wrongly now i've discovered it) the fuse was ok.
Borrowed a 10A mini-blade fuse from a friend with a non-roadworthy Rover 75 and hey presto, washers washed again! 😛
As i've not needed mini-blades until now, i invested in a 120 piece set on ebay :
https://www.ebay.co.uk/itm/232818816362
A set of 10 different values, 12 fuses in each value for a mind-blowing £4.65 delivered! Assume P&P is £3.35 considering the size/weight and that leaves £1.30 for the 120 fuses or a smidge over a penny a piece! 😮
I haven't discovered the low screenwash message in the S-Type yet, fairly sure the XJ40 i had ~23 years ago had similar, i know my Volvo 760 has a warning lamp for low screenwash (needed on that, the way it uses screenwash!), the first 827 Sterling i had (a Mk1c 1988/F reg) had a warning lamp on the "Vehicle Computer" but the Mk2a doesn't and a few other cars i've known/owned over the years have had it.
As you might guess, no handbook came with my S-Type, that said it did have a large history file with loads of receipts, it was an estate sale to the dealer i got it from and one previous owner + demo, low mileage, FSH etc.
Still getting to grips with how things work, what doesn't work and shouldn't but i expect it to, what works when i don't expect it to and so on.