Hi David,
Usually ISP's (here NTL) don't block the SQL Server port, so working of 'telnet 87.117.234.246:1433' isnt necessary. I'd suggest you to try connecting to your DB from a different machine or network. Calling NTL may help clearing any thoughts of port-blocking.
Or you can have a ticket opened up with our support dept. They'll get your issue sorted out ASAP. Thank you
