The cancelling at 6 mths stage is very straight forward. I got a reminder call from the dealer, and single quick call to Honda finance UK got final cost over the phone and email with details to allow online payment. No tricks, hardsell, multiple transfers, nor joy of se asian call centre. Found the whole finance experience ( my first) to be painless and trustworthy.
On forums for other brands was advice on cancelling early with required legalise and takes of blowback from dealership than loose finance commission.