Factor in that there is no guide to pay, you will tip the gillie as you consider appropriate, but he is employed by the estate/ beat & so his wages are included in the price of the fishing. The tip will reflect how you feel you have been treated, if he makes you welcome, spends time with you & gives good advice [A lunch time cup of coffee doesn't go amiss either!] then tip accordingly; if he's surly, uncommunicative & spends all day in the hut in front of the stove having given a vague wave at one of the pools saying ''yer fishing there...'' then again... tip accordingly. It shouldn't be based on the catches as this is beyond his control, but the effort he puts in is the important consideration; if it's one gillie on a 4 rod beat & he's done a decent job then I feel £20 per day is plenty per rod, but if you are in a boat with him on the oars for long periods then it's fair to up this a bit to reflect the effort; if there is a boat & it would be the best course in the conditions but he can't be bothered to use it then give him a hand shake at the end of the day with an empty palm - next time he may make the effort.
Price-wise, the range you were given is about right, you will certainly find some pretty decent Dee or Tweed beats in the £70 - £100 per day range at this time, but if you have confirmed your visit book as early as possible as the best 'buys' always get snapped up first.
Regards, Tyke.