A title is not required
I'm shocked...callerid spoofing has been around in this country for years now - I've even received calls from BT which have presented as 01234 567890 in the past. The sales droid struggled to justify why I was so pissed off - didn't really understand the concept of callerid, which shows how many years ago it must have been!
I really thought the public had realised by now that callerid could not be trusted, and that it could be spoofed.
From memory, all you need to do this is an Asterisk or similar system, hooked up to an ISDN line. You can then choose which number to present. Been a while since I looked into this though, so could be wrong on the line type required - might even have been a straightforward business POTS line.
And £5 for 10 minutes - seems absurdly expensive to me...must be to pay for the lawyer fees they're probably going to occur when people start to use the service in a fraudulent way (I can think of a couple of legitimate uses, but most are fraudulant).
And there is an icon on this post, the only worthwhile one, marked 'None'....