Well, I'm more confused now than when I started! lol
Nah, only joking, the advice has given me a lot to mull over today and after weighing up the options think I'll go for a daysack strictly for walking for now and then I'll get one for all my camping needs (whether it be one night camp or the planned seven nights WHW). Otherwise I reckon I could possibly get caught betwixt and between.
I've taken advice on board and narrowed it down to a couple of the Osprey ones (Talon 33 and Stratos 34) and Lowe air zone trail 35. They should be more than capable of comfortably carrying maps, glasses, phone, my waterproofs, food and drink for both as well as a wee towel for my doggie.
I'm in town tomorrow and will try to nip into Blacks early doors and check if they have a 'nae dugs!' policy when confronted with a gullible bloke they can fleece for a few quid. Hopefully they don't and they'll have the ones I'm interested in.
Again, thanks for all your input, it was appreciated..........now about this mid layer malarkey....