The best way of purchasing is always via cycle to work schemes which a load of companies offer.
Electric bikes are included too.
I have purchased about £2k worth of bike and accessories without committing any capital to it.
You pay it back via your wages but the benefit is the saving in Tax and NI.
Took 18 months pay back but saved about £800 - effectively 2 bikes were free.
I don’t know if that really answers your question - electric cars and vans are more my specialty.