Here are links to useful sites - other societies and organisations, other studs, places to hire donkeys from, suppliers of donkey suitable equipment and clothing - and generally anyone we have interacted with who we found useful! (No guarantees they still offer the services / products we used, but at least it will give you a clue where to start looking)
And nothing at all to do with donkeys, but if you live in the Essex / Herts / North London area and are looking for a great, family run, flexible and cost effective glazing firm