Yes, you are likely eligible to use the service depending on the requirements of the service. However, it is possible that you may experience restrictions due to your IP address. Depending on the service, they may be using geolocation to determine eligibility and if your IP address is coming from the UK, they may not recognize you as being from Nigeria. You may need to contact the service provider directly to determine if they can make an exception for you or if there is an alternate way for you to access the service.