Occupational therapy referral

I've got a letter today from children's occupational therapy service. B's Physiotherapist has referred him to OT about his difficulties with developmental delay. They offer an initial assessment and intervention in the form of therapy sessions and home or school therapy programmes. There is a high demand for this service and there is a long waiting list (bla bla bla- where have I heard this before!) They aim to offer an appointment within 18 weeks. I've got to fill out a questionnaire and send it back.