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What you need to do is retune the TV, but when it is finished look at the regional settings. Or if the regional option is available before retuning, retune selecting your area so then you get normal BBC channels. It's likely that at the moment the channels for BBC are located at the very top end of the channel list say? - channel 800+.
You are clearly picking up signals from many transmitters. With regional settings you can change it to the area you live in.
But you will have to take into account how good your aerial is. Otherwise the signal quality will not be good on same transmitters. So the set may only suggest those with the best quality signals.
ITV stations might also change.
When done it will move the channels you mention to the top end of the guide, to 800+.
Note many HD channels have no regional options. For example here in Yorkshire we only get ITV Granada and not Yorkshire TV on the HD channel for ITV1. And BBC1HD does not show any programmes when local news comes on.
Reset Or Re-tune? If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.
It seems odd to me that you say it is just ITV1 and Ch4 which have problems and you do get ITV2. ITV1 and ITV2 are on the same mux, are you sure it isn't ITV2+1 you are seeing?
Mux2 carries the following channels:
ITV1, ITV2, ITV3, ITV4, Ch4, E4, More4, Ch4+1
If you are getting any of the above (and not the +1 versions, except Ch4+1) then it is not a signal problem but something more mysterious. I guess it is possible the STBs you have are exhibiting a problem which is preventing just 2 channels from loading but I've not come across that before.