Costs for my 32A commando socket & OHME cable:
15 metres 10mm armoured cable, cleats, glands – £78.90 inc VAT
OHME cable – £200 inc VAT from OHME using my Octopus Energy account number
32 amp switched interlock 3 pin socket 220V – 250V IP67 2P+E waterproof blue single phase interlocked connector 32A – £39.95 amazon prime
various screws to anchor the cable to the wall, a spare 32A fuse for the fusebox (I had a whole fusebox spare already so no need for extras), so I didn’t cost these, and my tame electrician friend had an earth rod handy
The other cost is of course feeding my electrician friend, but I enjoy that & never count such costs because I do them favours such as rescuing them in the middle of the night when their motorbike disc lock key broke.
Your other path is to get a charge wallbox such as the QUBEV – EV CHARGING UNIT | TYPE 2 SOCKET | 32 AMP/7.2 KW | IP65 | (18th Edition) at £300 and get your own electrician to fit it, you’ll still need armoured cables, etc., and you may need a longer Type 2 cable, but it’s another option. I don’t like spending money hence I went for the OHME option to save maybe £50 plus the Octopus Agile tariff to possibly save more later on electricity.
The cheapest option is the granny charger & extension cable/longer lead, but the long term safer option is going to be a wallbox or the 32A commando & OHME combination.
If you need to cross a path with any cable you’ll need some sort of bright coloured anti-trip strip, they are about £20 a metre, avoid crossing a path is at all possible, avoid crossing a public path because you don’t want a debate about legalities (it is legal still) with your local council, and you can’t cable across a road so don’t. There are some pointers from Hampshire council as to how to go about such things online, but your council maybe related to “Adolf”.
(note, I just spent £295 on a manual wheelchair for leisure use because I’m not spending a fortune on diesel).