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Part of the issue may be that your home addy IP is not static but can change (not often but it can change).
If you have a router or similar at home, together with any firewall you'll need to open the necessary ports to allow the VPN.
It's not a good idea to post your own IPs. Unscrupulous people, may decide to have a play with it - I'm deleting them.
this isn't really a ntl broadband issue so I'm moving it to Networking.