Brian Matthew played this one today on Sounds of Sixties. It is not one I remember hearing previously, but it is superb. It was released late in 1969 but wasn’t a hit (it got to number six) until 1970.
Arrival were from Liverpool. Their details are on Wikipedia here.
I have put two versions of the track below from YouTube.
The first is just the soundtrack with pictures of cats, which you might prefer to the second version, which includes Jimmy Savile at the beginning. You have been warned. Sorry about that, but the subsequent recording of the band playing the song on Top of the Pops on 29th January 1970 is a real gem.