"On 19 September 2012, the Freeview TV guide will be updated. As a result, some existing channels are moving to new numbers.
To receive the update, where equipment does not pick up the changes automatically, viewers simply need to retune their Freeview* TVs and digital boxes after lunchtime on 19 September."

The changes are:

•Dave (from 19 to 12)
•Yesterday (from 12 to 19)
•Really (from 20 to 17)
•Gold (from 17 to 20)
•Food Network (from 49 to 48)
•ewellery Channel (from 60 to 49)
•Two further changes are in appeal and the results will be announced shortly.