We are involved in (so far as we know) the largest residential V2G trial in the world (certainly, the largest in the UK). Some links:

https://www.indra.co.uk/v2v-grid-to-vehicle

https://www.ovoenergy.com/electric-cars/vehicle-to-grid-char...

https://www.cenex.co.uk/projects-case-studies/sciurus/

OVO Energy that’s the one! Sadly I appear not to be in the pilot area.

The trial included people all over the country. Alas, the original trial is coming to an end, so they haven't been accepting new participants for quite some time.

If you want a V2G, you might try contacting Indra though we really sell more to installers rather than direct to customers. Alternatively, if you have a local(ish) installer that installs Indra's smart chargers, you could try inquiring through them.

I know it is possible to optimise to octopus's tariffs, but I don't know how available that is yet from the commercial side of things (I work on the technical side).

> "Nissan were looking into V2H for years but not sure what happened with it."

In the UK, there are a few companies offering V2G packages for the Nissan Leaf. For example, Octopus Powerloop (available in London and parts of South East England):

https://www.octopusev.com/powerloop

Second gen Leafs are equipped with the proper hardware - at least in Japan.

I believe all current-generation LEAFs worldwide are V2G-capable.

Basically every Leaf since 2012. Also Mitsubishi Outlander PHEVs work too though their batteries are quite small.