to produce a national ITV programme schedule listings magazine. This magazine was called the TV Times, originally the title of the London listings magazine (and also briefly used by the Midlands magazine). It replaced all of the regional magazines, except the Channel Islands publication, which continued until 19 October 1991. Before the changes were implemented, however, the prime minister Harold Wilson appointed Lord Hill as chairman of the BBC Board of Governors and replaced him with Herbert Bowden, also known as Lord Aylestone. He reviewed the changes Hill had made, but allowed them to stand. 1968 strike The implementation of the ITV changes led to industrial unrest in the companies. Although there were no job losses in the system – this was an ITA stipulation – people were forced to move from Manchester and Birmingham to Leeds, from London to Cardiff and, perhaps less troublesome, from one part of London to another. Many staff stayed in the same jobs in the same locations, but now had a different employer. Since this meant that staff were being made redundant (albeit with a guaranteed job to go to), the unions required redundancy payments. However, these payments led to problems in staff not receiving them, who were changing company but not location, as in the case of the Teddington Studios. The unions asked for payments to be made in those cases; the companies responded by drawing the line, and wildcat strikes broke out in the weeks before and after the changes came into effect. By Friday, after the changes, a mixture of strike action and management lock-outs had taken ITV off the air, and for most of August 1968, the regional network was replaced with a single national service run by management. By September 1968, with both sides claiming victory, all workers had returned to work. However, memory of this strike would cause more industrial unrest in the decades that followed. Post-strike and colour television This era also saw the introduction of colour television to the network and the introduction of the new 625-line system. During the 1960s, some commercial companies proposed the introduction of colour on the 405-line system, but the General Post Office insisted that colour should wait until the higher-definition 625-line UHF system became standard. ITV eventually introduced PAL colour on this system from 15 November 1969, simultaneous with BBC1 and two years after BBC2. This did not, however, spread