What's the state of play with having a calling parties CLID forwarded
out onto the PSTN or mobile networks by an IP PABX. Do any UK VoIP
services offer this capability ?

I read of users in the US or Canada who for example call forward from
their Vonage VoIP service to a cell phone or landline and receive the
caller ID of the original inbound caller (rather than their Vonage
account, which would be useless). Can we get this ? Does Vonage UK
achieve the same ?

Phil