if you do it in the UK you can visit the schools/areas before you start.
Jump on an ezy jet up to INV and have a trial flight then go on the train down to PIK and do the same. You should be able to get a bnb for about 15 quid a night for 3 weeks. Or you can break it up into blocks of a week. The savings you will make in landing fees will cover the flights compared to southern schools.
Don't be worried about folk saying the winds are to high up north. I used send students up solo in 25knts and it was only when the winds got below 5knts that we ever had any issues. Its usually about 10-20 knots down 23 and they haver a short cross runway when its from the north or south.
PIK has similar advantages.
Apart from anything else the views up north are stunning