IPTI is a good one for insurance, as they offer comprehensive cover at fairly reasonable fees.
Another piece of advice I would give, is this, you should decide if you want to do sports massage or sports therapy. If you do sports massage on its own you should go with a company such as the London School, as you will need an SMA (sports massage association) accredited course. Unfortunately neither VTCT or ITEC offer SMA accredited courses, and therefore, graduates from these backgrounds will find it increasingly difficult to find decent employment.
If you chose to do sports therapy, then look for one of the previous ones I mentioned, as within the next few years, sports therapists will become chartered and state registered, as physiotherapists are now. This will open up the industry no end, and in my opinion, will make quite a lot of sports massage therapists redundant.
Richard