For those of you interested in actual fleets of bus companies: do their fleet numbers really irritate you?

As an example of Go North East's fleet:

I would much prefer it if Go North East worked their fleet similar to Stagecoach, with different numbers taking on different types of bus - minibus, midibus, full size, double decker, articulated, coach etc.

1 to 1000 could be ancillary vehicles - 1xx, 2xx, 3xx, 4xx perhaps denoting different types.
1000 to 1250 could be dedicated MPD numbers.
1250 to 1500 could be dedicated Solo numbers.
(and carry this on for all other types of vehicles).

Something that really bugs me is the numbering of GNE's B7 Geminis:
http://d.pr/i/Ks3m
41, 42, 43, 62... Hardly makes sense to me.

Here's another one. A load of Prestiges in the middle of the Volvo B10BLEs:
http://d.pr/i/ALgo
Why? I don't know what's worse: having them there, or what it will be like when they're scrapped and no longer within the fleet. A massive jump between the two B10BLEs there.

I don't know what to even say about this one:
http://d.pr/i/4biq
Further Solars continue after the mass of dual door B10BLEs also.

Surely a gap in fleet numbers would have been appropriate here so that, if further rigid Citaros enter the fleet, they become standardised in the sense that they're together with the Citaros already in the fleet?
http://d.pr/i/PKvD

Another example of the above:
http://d.pr/i/g2Lc
Further investment into B9TL vehicles was obvious, so why have B7TLs there amongst the branded B9TLs?

In short, a different vehicle type should have its own dedicated set of numbers to allow for further investment into the fleet with that vehicle type.

Here's something else that annoys me too - Arriva this time, though there are examples of this happening in GNE's fleet too:
http://d.pr/i/HsEQ
Surely 4709 should be DHC, 4710 should be DHD and 4711 should be DHE..?

What are your opinions on the ordering, numbering etc of fleet lists?