That's a fantastic garden IAP. Your pussies are very lucky to have you.
I looked after a stray for about five years - she was a lovely cat, extremely timid, and I could tell you lots of stories about her (and I have told some already on here).
I took her to be put to sleep nearly two years ago, but I still think about her most days.
Some of the memorable ones who are gone:
Ivan-cat
Freya-Norwegian Elkhound
Twinkles-guinea pig
Sake
Quark
Mitsy
Cleo.....all cats
Bramble...allsorts dog