Yes you can point a UK 0800 number to a country outside the UK.
Your customers won't be charged for calling the 0800 Free Phone number but you would pay to receive the call on your telephone number outside the UK.
Expect to pay set up and monthly rental.
Bear in mind that the charges to receive calls will be variable according to the country the call terminates in. The USA and Canada are relatively cheap but some countries are expensive such as Nigeria and India where it is perceived by carriers that the credit risk may be potentially higher.
