I have a Zappi as I have solar Panels. An old colleague from way back when became an installer and he did mine. He is in Market Deeping, Cawoods Electricians.Good to see another Lincoln owner and prices you've been quoted aren't too dissimilar to mine.
Off topic question, have you had a charging point installed as yet? I'm struggling to find a local installer that's approved for the grant.
They did a good job and install various chargers and are OLEV accredited