£5000 - PPL
£7000 to £10000 - 100 Hours Hour Building (depending on a/c)
£1900 - Bristol Groundschool ATPL Course
£770 - CAA ATPL Exam Fees
£5000 - JAA CPL Flight Course
£1500 - JAA ME Flight Course
£12000 - JAA IR Flight Course
These are ball park figures for training in this country...
Just so you're aware single pilot IFR ops which you'd like to do require at lesat 700 hours of flight time as per the regulations so probably best factor in an Instructors rating FI(R) at around the £5000 mark.
To do the type of work that you'd like to do will require at least a JAA CPL/IR SE ME so you might as well do the JAA ATPL exams otherwise you'll be doing two written courses (JAA CPL and JAA IR) and wouldn't have the option of upgrading to an ATPL at a later date.
About the only thing you won't need to do is an MCC course.