Was thinking of taking DS (22 months) to a local zoo - I note on their website that carers are admitted free of charge (as long as they accompany the individual with special needs).
I am in receipt of carer's allowance - DS gets middle rate DLA.
I e-mailed them and asked them what supporting documentation I would need to show at the gate. It then transpired that because DS is under 3 years old and would be charged the usual £1 admission price for a child of that age (as opposed to £8 for a special needs child above that age), that I would have to pay the full price of £14.50.
Therefore, if I visit the zoo before DS is 3 years old I will have to pay £15.50 entrance fee.
After he is 3 years old, I will only have to pay £8.
In other words, they do not appear to acknowledge the fact that children under the age of 3 with special needs exist, or that they have carers.
Hope this makes sense! 
Has anybody experienced anything similar before?