here we go round the mullberry bush, on a cold and frosty morning?

I do believe the mulberry bush is in wakefield prison grounds and as far as i know it is there because women who were imprisoned many centuries ago had their children with them, the children had to circle the tree all day long while their mothers were busy working in the prison, hence the song they used to sing 'here we go round the mulberry bush on a cold and frosty morning' I wonder if they still make the prisoners there do the same these days ? bless their little cotton socks tc xxx