I had a look at the SWITCH2 website!

I have been in the energy industry for 8 years and I have never seen this!

I found this:

5) Can I change my supplier?

Answer: You are connected to the communal scheme, so this would be difficult. However with the benefits of being connected to the communal system such as the lower costs, better service and more environmentally friendly credentials, you won’t want to!

The scheme provider will ensure that the cost of energy remains comparable to conventional utility supplies.

So it says it would be difficult not impossible!

I would contact other suppliers and see if they can support this system.

You may be better contacting the host supplier for your area!?