What we do Adults How do they book on? It is essential that they are invited to attend a class as places are limited. Once we receive the referral form, we will send them a welcoming letter and invite them to the next available class. Depending on their locality, we may need to generate more referrals to establish a new class for them. Referring them will ensure that the instructor has their details and that there is a place for them. Anyone who arrives on the day without an invitation will not be able to take part.