Nice one Simon - the first three look like a long time lapse of a birch polypore (
Piptoporus betulinus).
http://www.mushroomexpert.com/piptoporus_betulinus.html
The next one is a little more tricky - Root Fomes (
Heterobasidion annosum) is the right sort of shape, but the colour isn't quite right and the guide I've got says more common in coniferous wood, whereas that looks to be on birch. Another possible as is
Inonotus radiatus or the giant polypore (
Meripilus giganteus) perhaps?
Good pics though - will you be going back there at all?