Looks like a young beech tree growing from a garden wall.
No interactions present.
Alder would not be in leaf in January either.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
The leaves are the right shape and the wall might provide enough shelter coupled with the mild weather.
Quite a few things stayed in leaf late this year.
It is a long way south where the weather will be even milder than it is here.
This is not Alder. The toothed leaves (completely unlike Alder) suggest the ID of Quercus ilex is correct.
It is common in my patch and the "saw" edged leaves are what i am looking at here. Evergreen oak has leaves that are more "shiny" and with less prominent veins.
Lat/Lng: 51, 0.05
OS grid ref: TQ439242
St Leonards on sea, East Sussex