Im Modular and im quite a bit into it.
PPL - Canadian = approx 4K
Hours - also in Canada = Approx 7k
ATPL - 1000 for the course, £66 x 14 for exams plus some hotel costs etc = Approx 2.5k
CPL - UK based = Approx 5.5K
IR - UK bases = 11-13K
MMC - not sure where yet = 2.5K
If im good enough to get through the CPL, IR, MMC 1st bash will be about 31-33K for damn near everything.
You could put £600 a month into something around that type of total cost. Would take a while. Flying regularly is the best way to do it as you dont relearn things from your previous hours. On current prices on say a 152 you could fly around 4 times a month for that.