Well I would say that an IR probably isnt worth the cost to you at the moment.
If you are a new PPL holder and low hours (you need 200 for an IR issue...) then it is likely you will struggle. I personally would suggest night & IMC ratings first - then if you still feel you want to do an IR then go for it. The only real privileges the IR brings in the UK is flying in class A (however the a/c needs to be equipped to do this), and flying overseas in IMC conditions.
Hope this helps.