I have done all of my flight training part time due to the fact that I work a four on four off job and I saw little point in leaving a well paid job which provided a comftable lifestyle in a recession.
Everything including the CPL went well and I completed everything on minimum hours, then came the disaster of the IR course. This course is very intensive and demanding, if you want to ensure that you pass first time then you need to give this module of your flight training your attention on a full time basis at a high quality school such as stapleford. I have so far taken and failed three IR flight tests at an estimated cost of £20,000, I believe that a siginificant factor in this has been the four day gaps that I have taken in my training to go back to work. I am now rebolstering my finances and looking to retake the IR in feb/march at a better school using my annual leave for the retake.
I would strongly advise against part time study for the IR, this needs your full attention.