Dont worry too much about landing fee's. Most schools block pay the relevant airfield operator so you'll find the landing fee's are all included in the school's hourly training cost.
That covers home base but there are the land away fees as well which my school didn't cover. Probably fair to say that there are more during the CPL with all of the cross country flights and lots of landing practice. Some are only a fiver or tenner but bigger airfields can charge a fortune. It may also depend if you are going to be paired up and for the course (a good thing) and back seat. You will need to swap around during the day and of course can only do this back on terra firma. Of course if you are repeating parts of the course then this will all add up.
As an aside where you do your training and the number of available CAA test routes can play a big part in the cost of all of these "add ons". Some airfields will have a very small number of test routes. Down at Bournemouth I seem to remember there were loads of places the CAA could take us. That gave us a fair amount of variety in the training but also added up after a while.