". . . wood for the trees"

[Stephen Furner]

I have a couple of questions I expect have been asked many times before so I apologise in advance for asking the obvious. I’ve had few searches on the CAA www site and Google but can’t seem to get a clear answer myself . Can anyone can point me to an appropriate UK CAA document or authoritative www site where I can look up the answers:
1) “Airways equipped”/”IFR equipped” – what is the specific kit that should be present in a light aircraft for it to conform to this description?
2) Interior refurbishment of light aircraft – what CAA forms or procedures need to be complied with if renewing the interior of aging aircraft?
Many thanks for any clues about where to look for this information .
Stephen