Pre 1988, BBC Radio 1 didn't have it's own FM frequencies, but was allowed use of the BBC Radio 2 FM frequencies at certain times, usually
Monday - Friday 10pm - Midnight
Saturday 1pm - 7.30pm
Sunday 5pm - Midnight
Radio 1 usually also got use of FM on UK Bank Holidays
By the time of this example, Radio 1 does have it's own FM frequencies in some parts of the country, but still borrows Radio 2's FM frequencies for the Top 40 on Sunday evenings
This is from Sunday January 15th 1989
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