Apart from setting up a favourites list no, you cannot change the order of the EPG setup. Channel number & order allocations form part of the agreement with the channel owners, plus Public Service channels have "Prescribed" slots set by OFCOM that must be adhered too.
Pay service providers also use the EPG as a "shop window" to try to encourage people to upgrade by seeing the channels they are missing out on.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile