Thanks for the suggestion of 1:1 NAT. However, it doesn't seem to work. The ISP suggests this can be done one of several ways with third party routers. https://btbusiness.custhelp.com/app/answers/detail/a_id/6781/~/managing-your-ip-address-after-an-account-upgrade/c/5099/ I think I should try the static route idea at the end - but again, not to sure how to go about it!
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