If you can say hand on heart that you have the following abilities you'll pass an IMC rating.
1. You are a compitent PPL.. .2. You have a vague idea on how to accomplish a hold and instrument approach.. .3. You are able to blag those abilities every 24 months.. .4. You are able to realise that the privalages offered to you as an IMC rated pilot should never be used in anger as they could end in damage to the aircraft and others.. .5. You realise that the previously mentioned privalages are just a common misconseption and with English weather you are better off staying on the ground rather than taking off with 3 oct+ cloud cover blo 3000' if you have no real IMC experience other than your IMC rating.
If you are willing to put in a week of evenings for study, you'll be fine!