Hello and welcome to COL, always a pleasure to have another member join who is owned by a working cocker!
I have Bella, my red working cocker bitch who I use for shooting and as a great companion for walking with.
I'm afraid that I can't help you on the long walks front in your area, but I bet Saffron is a very fit little dog clocking up that sort of mileage in just one week!
Anyway, do feel free to ask about anything you'd like to know more on, for example: trialing or gun dog training, as there are some very experienced working cocker owners, breeders and trainers on COL.
Best wishes
Mary
PS: would love to have a peek at Saffrons pedigree, I'm interested to see what lines she carries and where/from who in Wales you got her from