Background: The Undertones are a punk rock/new wave band formed in Derry, Northern Ireland, in 1974. From 1975 to 1983, the Undertones consisted of Feargal Sharkey (vocals), John O'Neill (rhythm guitar, vocals), Damian O'Neill (lead guitar, vocals), Michael Bradley (bass, vocals) and Billy Doherty (drums). Much of the earlier Undertones material drew influence from punk rock and new wave; the Undertones also incorporated elements of rock, glam rock and post-punk into material released after 1979, before citing soul and Motown as the influence for the material released upon their final album. The Undertones released thirteen singles and four studio albums between 1978 and 1983 before Sharkey announced his intention to leave the band in May 1983, citing musical differences as the reason for the break up.
Context: The Undertones formed in Derry, Northern Ireland in 1974. The band members were five friends from Creggan and the Bogside, who originally drew inspiration from such artists as the Beatles, Small Faces and Lindisfarne. The band initially rehearsed cover versions at the home of the guitarists, brothers John and Vincent O'Neill, and in the shed of a neighbour. (In early 1976, before the band had played gigs at any venues, Vincent O'Neill left the band; being replaced by his younger brother Damian.)  Beginning in February 1976 the group, at this stage still unnamed, began playing gigs at various minor local venues, including schools, parish halls and Scout huts, where the band's lead singer, Feargal Sharkey, was a local Scout leader. Sharkey was also responsible for giving the band their first name: at the introduction to a gig at Saint Joseph's Secondary School in Derry on 16 March 1976, Feargal Sharkey was asked the name of the band and quickly replied "The Hot Rods". At a later gig, Sharkey named the band "Little Feat": another name already used by another group.  Later that year, drummer Billy Doherty proposed an alternate name for the group: The Undertones, which Doherty had discovered in a history book. The other members of the band agreed to the proposal.  With the arrival of punk rock in late 1976, the artistic focus of the band changed. Artists such as the Adverts, Sex Pistols, the Buzzcocks and, particularly, the Ramones became major influences on the Undertones.  In addition to being a scout leader, Feargal Sharkey worked as a television repairman and delivery man. The van which Sharkey drove in this employment was used by the Undertones to transport their equipment to and from various venues.
Question: when did they make it big?

Answer:
With the arrival of punk rock in late 1976, the artistic focus of the band changed.