From the website the full name of the church appears to be The Gap Anglican Church of St Mark, with The Gap Anglican Church the short form. The current building was opened in 1978. The complex is currently undergoing significant redevelopment and a portion of the site is a construction zone. The complex is due to be officially opened on 18/2/2018. More historical information/photographs of the church/congegation are invited. Photographs uploaded 29/12/2017.
A history of the church is available: Saint Mark's Church The Gap - The Parish's Journey From 1920. See the church website-
http://www.tgac.org.au/welcome/history