That sounds ok, however you have contradicted yourself by saying he's 100% safe then saying he needs a confident rider hacking?? It also doesnt have an age or height? Most adverts won't allow you to have so many words either. But he sounds lovely!
Try contacting trainers directly to see what they've got..that way there more likely to be honest. Also places like ascot sales are a good place to go. To be honest even privately ex racehorse are being 'given away' you can get a nice 4yr old for £500!!! Or rescue places? There very easy to access!