I think you haven't got the principle with whom bouquets and channels work. First of all, if for "favourites" you mean the bouquet with this name, if it doesn't start from 1 it means it's not the first in the list. If you want its channels to be numbered from 1, you have to move it at the top, as the first bouquet in the list.
Secondly, Favourites it's not compulsory. For instance, I don't use it as the main one. In my VU+ it is a very secondary bouquet and I created a bouquet meant for the indispensable channels and I put it at the top. So it goes from 1 to about 120.
The other bouquets are just for other purposes, like grouping all channels of a kind I want. But I don't put EVERY channels within one of the bouquets. In all they contain about 300 channels and the second bouquet in the list assign the following numbers to its channels. So, if the first end with 120, the second starts from 121.
This also means that if you remember the first number (even approximately) you can jump to this bouquet directly selecting a number corresponding to a channel in it.
And there is also an option (that I don't use, for instance) that allows you to zap to the next bouquet when you reach the end of one. In the above example, you'd go from 120 in the 1st bouquet to 121 in the 2nd. In my case, I don't want this behaviour and it starts from 1 when it reaches the end.
This is not a Humax or similar STBs where you have all channels together from 1 to 5000. The channels not used are always accessible by, UP and and Green (or RED) button and they are already grouped by satellite/service by the system.