Have a look at this website
UK Estate agents with homes, houses & property for sale on rightmove.co.uk which will give you an idea of rental prices. Dundee is certainly far cheaper than London, but don't forget the dreaded council tax that every property has to pay. I was also under the impression that everything up north was cheaper, but not according to the council tax figures for Dundee. I used to pay a lot less (two years ago) in a London suburb, - have a look at this link
Council Tax Bands - Dundee City Council.
Good luck with your plans.
Michelle