When you pay the cheque into the account, wait a few days, and make sure it has certainly clear, i.e. give it 2 days after it is shown as cleared funds on your account to be sure. And ring up your bank to confirm this.
It is better to be safer than sorry.
Don't feel intimidated or that there is any need to rush. You will send it when you are ready, the worst you could get is some negative feedback, but that aint that bad, in comparison to losing £215.
I think someone may have mentioned, why not ring up the school or whatever and cross check details just to make sure the person actually lives there.
Be cautious and take your time. Make sure the cheque actually clears before sending it off etc, and double check with your bank when paying it in.
Best of luck
Ian