Everyone spends differently but you would be talking 40-45k, im on course to spend around 50k but I treated myself a bit!
The point to remember is if you choose modular then you
don't need the total amount required to start your training. I started paying for my flying when I was 18 while in full time employment, i'm now 22 and i've saved up enough for my CPL/IR and we're all entitled to the career development loan (maximum 8k interest free loan while out of employment and you dont start paying it back until your employed) which I may use for the FI rating.