This is the rather gloriously named Sun Oak [can't find out why as yet] in Horsham which "apparently" is the second oldest oak tree in the country. Unfortunately those sort of spurious facts can't be verified one way or the other, but he is a magnificent specimen with a trunk spanning five metres and is thought to date back to the 1200s. It is traditional to doff your cap to him on May Day.
May Day greetings to all!
PS I now know that it gets its name from the belief that it will lay its shade across an acre on Midsummer's day.