I must say I am amazed at the attitude of some here that ASD does not lead to additional costs. I speak from our personal experiance it does. I feel no shame for recieving DLA for our DD as without it she wouldn't be able to lead the life she does, which is far from normal, but closer than without.
Our DD's DLA is used for things like the following ( and lots of other random expenses cause by DDs ASD, but too many to list)
Running a car - we couldn't afford this without the DLA as only one of us are able to work due to not being able to find childcare. This car is DDs lifeline to getting out and about, she cannot handle public transport and has very bad walking and safety issues, she is 7 now which is getting too heavy to carry. We never had a car before as we have ggod transports links, but we never knew these would be unaccessable for DD. plus the extra petrol costs because we need to use the car for even short journeys due to DDs problems. It is only a fairly old car (1998) nothing fancy.
Communication supplies - we buy alot of visual aids to help our DD learn, know what is happening, tell us what is happening when she is unable to use words.
Money for classes sutable for her needs - we cant attend the local free school clubs as there is not enough adults to children, clubs benefit our DDs social needs, but we must pay.
Cloaths - DD can only handle very certain things, fine if the cheap stores have the "right" stuff, but we have no choice but to get more expensive at times due to what is available.
Extra electricity - we need more lighting, more washing (toilet problems and smell issues) have to have fans on the whole time as DD needs the noise etc etc.
Saftey equipment - for the house, car everywhere. The new car harness we need is over £100 in its own.
generally add the word SN to something, triple the price - maybe the gov should sort that out!
There are so many more, but I hope this shows some of the costs we face that we do not have for our NT children. These coupled with less earning ability make DLA a life line. Our DD would have a much less "full" life without the financial support we get.