You will also need to obtain an ACPO police certificate, the details of which can be found
Here.
It will cost you £35 if you need it within 14 days (10 working days) and £70 if you need it within 7 days (5 working days.) It has a limited period of validity (usually 90 days for visa purposes,) and you will need to pay and obtain one for each subsequent visa application for a number of countries.