I found the Tunnel Users 45 a couple of years ago in a Berlin second-hand record store and couldn´t listen to it in the store, but bought it anyway because of the nice graphics, somewhere between the B 52´s and the Revillos.
Dance? is about a girl who takes the initiative because the boys are too shy to dance.
Sun Arise Dub is a sort of sped-up dub-style cover version of Rolf Harris´British #2 hit song from 1962 Sun Arise but with some added 1982 background noise.
The Tunnel Users were from Liverpool and I found the only information about them on a Welsh music site:
Tunnel Users – band (1981-83) feat; Colin Pennington (gtr,voc) (later of Decemberists, Hell Fire Sermons, James), Phil Butcher (voc), Clint Gannicliffe (keys), Gary Rowlandson (drms) (died 2006), Paul Maloney (bass), Geraldine French (voc), Jeff Hill (keys). Played Larks in The Park Festival 1981 and noted for their live performances rather than recorded work. Rel ‘Ideas’ tape (Mar81) on a label(?) was run by Garry Gannicliffe and based at Gladville Road, Mossley Hill, L’Pool, L17, and 7″ Dance on Ex-Jukey Recs (Jul82).