Just for info:
On Bromley CR3 STB's the RF can be chnaged from the front of the STB
1000/2000 stb, hold ok, right arrow and press TV (the RF freq wil display on the STB display).
Then use channel +/- to change the RF channel.
Hold ok, right arrow and press TV to confirm the change.
4000 stb, Hold- Vol+, Select and press services (the RF freq wil display on the STB display)
Then use channel +/- to change the RF channel.
Hold- Vol+, Select and press services to confirm the change.