Changing the battery in an older style Skoda Fabia key.

While changing the battery in my car key I noticed that it was different from others featured in different video's. So here's how the battery is changed in this particular style. Note that the newer versions seem to have a simpler contact arrangement and the battery goes in the other way up.
The type of cell used is a lithium CR2032 which fortunately happens to be a very common cell. You can get them from most electronic suppliers, online and even some pound/dollar stores.