Unusual birds spotted in Mitcham London

Just seen a a group of about 4-5 birds, they're upright like a kingfisher or kookaburra. Quite big around 30cm in size and big at the back of their heads. Red tummy, with a black stripe through the middle and then a greyish/ brown ish back. They were making a clicking sound. Sighted in Mitcham in London.

I tried to take photos, but they weren't very good...