Hi Phil
Well I have certainly had clients who have done this in the past, but usually through local garages or car supermarkets rather than a national company. Sometimes it is easier for a family member to take the finance out in their name, and then you can make the instalments directly to them so that they are not left out of pocket.
Do be sure to get your Supervisor's permission if you are seeking to enter into a credit agreement, and that you can actually afford the payments without affecting the level of your contributions.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk