Similar situation to you 200+ hours, IMC etc. bored with expensive cups of coffee flying A to B to A. I too am considering CPL then FIC but wondering if realistically there will be any demand for P/T FI's in the UK. As for other commercial work I did talk with a Easy Jet Cpt. and BMI Baby FO who are also FI's whom I did my IMC with, they advised that for Air Taxi, the min. requirement can be 2,000+ hours and that there are lots of former airline Cpt. and FO's job hunting after the demise of various airlines.
I would be interested to hear from FI's or CFI's here who can shed light on the current FI jobs situation especially. To go to the next step for me will be approx £7k for CPL and £8K for FI, that's a lot of wonga if no realistic prospect of P/T FI as I have a job anyway and could elect to keep the cash and use it to fly something more interesting for PPL stuff. I see instructing as an enjoyable P/T role as I like teaching in general and as a means to fly regularly.