Yeah I think so. It should be OK now I hope!
The problem is that I'd added Voicebot into the admin pages for site admins, but when you're running on your own custom domain it doesn't work because Voicebot is only allowed to run on e-voice.org.uk domain - hence it was giving the forbidden error. It's my fault I should have thought of this before adding it, but I was excited to see if it could help people with admin tasks!
I've now removed Voicebot from the admin pages so all should be well again.
Thanks
Joe