I can't recommend Superfeet enough. Wouldn't do any serious walking without them.
If, on your way to Ilkley, you pass through Skipton, then the large market there is a great source of suitable gear. Mondays, Wednesdays, Fridays and Saturdays. They sell a wide range of work gear which doubles up perfectly well as walking gear .... and a fraction the price of branded stuff.
Don't underestimate the winter range of fleeces from Edinburgh Woollens. Have a look at them before you go. Worn under a windproof top they provide the warmth required for late autumn, winter and spring walking. I had one on in the Lakes and Dales early on this week and was comfortable during the rain, sleet and below zero temperatures (beneath a waterproof when necessary).
Don't disregard equipment just because it is not a big brand name .... but then I'm a tight Yorkshireman.