For the record, I went with Sipgate in the end on their "basic" £10 a month, unlimited plan.
I have no problem with the service, got my Polycom 335 setup with minor teething problems (config issues my end, nothing to do with Sipgate specifically).
Their support site seems inconsistent, for example, Voicemail is referred to as 50000 in some areas and 55000 depending where you look and they both go into different mailboxes and only one of them ties into your number (No idea what is going on there).
They did have a setup guide for my phone though which made things easy.
When I did submit a support a support ticket, I got this in the "auto responder" reply which in the short term, is concerning if I have a billing problem for example owing to the lack of live chat support for the UK:
*Due to an ongoing staffing issue we can not guarantee short response times. This affects all UK support teams.
We are already taking the right steps to remediate this unfortunate situation. Please excuse the inconvenience.*
I will consider giving these guys a go:
https://voipstudio.com/pricing/gbp/
They offer a free trial so nothing to lose
With Virtual PBX's being so prevalent and for the most part, not costing anything ontop of calls, is self hosting your own PBX in-home for a few users worth the hassle?
Thanks.