In 1980, the BBC began an experimental 'Ceefax In-Vision' service. Gaps in the schedule which previously would have been occupied by trade test transmission, were now being filled by a selection of teletext pages. The 'In-Vision' broadcasts - offering a digest of news, sport, travel and TV listings - were largely restricted to short, early-morning slots, with the test card playing the more prominent role during gaps in the schedule.
The first Ceefax 'In-Vision' broadcast took place on Monday March 17 1980 on BBC One. It was Monday June 02 1980 before the teletext 'In-Vision' service appeared on BBC Two.
Ceefax pages were typically broadcast from 8.30am to 9am (weekdays) (though by 1982 the 9am finish time had been extended until just before the first programme of the day) on BBC One and 10am to 10.30am (weekdays) on BBC Two. During the summer months of 1982, the weekday BBC Two 'In-Vision' service moved to 9.35am 'Service Information' had moved to 10.15am (rather than 10.30am), and 'Play School' was now shown at 10.30am (it's long-standing start time was 11.00am).
From 1980 to 1983, an 'In-Vision' service was also broadcast from 3.20pm to 4pm (weekdays) on BBC Two this was immediately followed by the appearance of Test Card G, for the afternoon 'programme transfer' (see below). At c. 4.45pm, Test Card F would appear, and remain until the next programme, usually an Open University production, at 5.10pm.