bobbydazzler, that’s fair. I had the same issue - they could only install 2 weeks after I had my i3. So just used 3 pin for 2 weeks which was fine, took about 10 hours to charge. I had to buy a very heavy duty 20m extension lead to cope as a “normal” domestic one kept tripping / overheating.
Not sure where in the country you are ? By the name - Liverpool ?
If you can get to me in Hampshire, you are welcome to borrow the extension (and 3 pin lead if you don’t get one with the car) as I don’t need it.
I did little research on Rolec, other that the guy who has one at the BMW dealer recommended it plus, more importantly, a Finnish company where I work (the Fins know all about this 1.5 million houses out of 2 million have home charging) runs a EV charge point installation for businesses / corporates - he uses Rolec. Boom !