Just got this email from them:
We have some good news: our sipgate basic service won't be closing!
While we've decided to focus on our business service, we are happy to confirm that we will continue to offer sipgate basic services. Your account login credentials, settings and functionality (telephony, voicemail, etc) will be retained unaltered.
We look forward to providing you with VoIP services in the future and apologise for any confusion caused.
Thank you for using sipgate.
Your sipgate team
BT Infinity 2 Broadband