"Under the local authority's byelaws cyclists caught riding in Strand Street, Castle Street and Duke Street can receive a fine of up to £2,500."
https://www.manxradio.com/news/isle-of-man-news/douglas-residents-warned-about-the-dangers-of-cycling-in-the-city-centre/

"No person shall cycle, skate on roller skates, a skateboard, rollers or wheels or any similar device on any footway or pavement in such a manner as to cause danger or annoyance to any person."
http://www.douglas.gov.im/index.php/component/docman/doc_download/213-douglas-general-byelaws-2013?Itemid=