Q: Mac Finance

Yes. Payment methods you can use in the iTunes Store, App Store, and iBooks Store - Apple Support.

UK Payment plans are available on the financing link on the Apple Store:

http://www.apple.com/uk/shop/browse/finance/PaypalFinancingLandingPage

You have other options in different countries.

You should consider the fact though that the computers do depreciate in value much more quickly than cars.      Some of the following places may be less of a burden if you are willing to consider used or refurbished, and may sell to the UK*:

http://www.macmaps.com/usedrefurbished.html

* Links to my pages may give me compensation.