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To add to dr.ido's excellent post on the channel allocations, the initial channels set aside for the introduction of TV was channels 1 to 10 (10 channels).
Around mid 1961 the allocation was increased to 13 channels by adding channels 0, 5A and 11.
The extra channels coincided with the loss of availability of the internationally recognized FM radio broadcast frequencies which had been in use on a experimental public broadcast basis from around 1951 to 1961. There was a fair amount of outcry over this at the time, however the opinion at the time was that TV was more important than high quality radio reception.
It was not until the mid to late 1970's when colour TV was introduced that the FM radio band was reclaimed by moving the offending channels (3,4 and 5) onto UHF repeaters.
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