Hi pannetone
ACE_Ed have a briefing paper on transport. I think this bit might be where you're coming up against a brick wall:
"School choice, transport and SEN
Parents of children with statements of SEN may find that their right to
express a preference for any maintained school is in practice curtailed by
transport issues. If the preferred school is further away than another school
that could meet the child’s needs, the LA could name the nearer school on
resource grounds. It is also open to them to name the parents’ preference
on condition the parents take responsibility for transport. See Special
Educational Needs Code of Practice 8:87-88.
However any school named has to meet the child’s needs. LAs must not have transport policies that aim to restrict parents’ preferences.
The remedy may be to appeal to SENDIST on the grounds that only the
further school is appropriate."
Also, Nigel1 has a point when it comes to non-attendance if no transport is provided:
"Transport and school attendance
Lack of transport can be a defence against non-attendance if the child lives
outside the statutory walking distance. Under EA 1996 section 444 (4) if the LA has not made suitable travel arrangements or given the child a school place nearer home the child will not be considered to have failed to attend.
If a child lives outside walking distance and is unable to attend because the
school bus can’t get through or parents’ car breaks down the absence will be authorised. If the child lives within walking distance he will be expected to walk in these circumstances. For more information see ‘Keeping Pupil
Registers – Guidance on applying the Education Pupil Registration
Regulations’ para 47 & 48."
Ds1 has full door to door transport to his ms indie - for now. Although, according to the SENCO at his AR last month, our LA are apparently rumbling about independent travel tuition, which won't be happening as far as I'm concerned, as for ds it would mean bus, train, walk, bus walk and he can't even be trusted to make it to the corner shop (on the same side of the road) at the moment). They want him to start making his own way there by the start of year 10 and he's currently just finishing year 8. While I will admit their independent travel training does look very good, ds1 is a long way of being ready for it and imo there's absolutely no way he would be able to do it, even by then.
In his case the school he attends was the closest appropriate school and our LA admitted this, as having been refused a place at the local academy, that effectively ruled out all the other secondaries in our area. Having admitted he was in the right placement, they were then liable to provide transport.
Things have changed, a lot, since then though and the LA has reduced the numbers of pupils placed out of area to 1-2 a year, with none at all going to ds's school. They have also changed their transport policy to include a rather worrying paragraph about developing independent travel skills in preparation for adulthood and efficient and effective use of resources - which basically means cost cutting and is unfortunately backed up by the new SENCOP and EHCP guidance. If we can get them to agree that they should continue to provide transport, I have a horrible feeling we're going to be told it's direct payments or nothing. Dps wouldn't be enough to pay for a door to door service and the money itself would be off little or no use to us, with two dcs at local schools and me unable to drive. 
The only glimmer of hope is in the ACE-Ed transport briefing document:
"Suitable arrangements – ‘Non-stressful transport’
Travel arrangements made by LAs must be ‘suitable’. This means that any
arrangements must enable children to reach school without undue strain or
stress and to travel in reasonable safety and comfort.
This will impact on journey times and also on matters such as pick up points. 2007 guidance suggests a maximum one-way journey time of 45 minutes for
primary aged children and 75 minutes for secondary.
Likewise travel arrangements involving multiple bus changes or a long walk
either end of the bus journey may not be considered suitable."
... but then the paper also says:
"Many LAs are now changing their SEN transport policies in light of rising
costs and also a desire to promote independence and sustainable travel.
In the past many children attending special school were allocated a school bus place as a matter of course. Now parents may specifically have to apply for travel assistance. Older children in particular may be expected to make their own way to school. Parents who find that their child is no longer eligible should ask whether the school or LA has any provisions for travel training. This may be part of the school travel plan."
Between that hovering over us like a dark cloud and his EHCP transfer coming up in the Autumn, I'm not feeling very optimistic about his placement at the moment, which is such a shame, because it's only just started working and he's finally happy there. 