Trentham also shuts for the winter on 1st November and is then closed until February/March when it opens at weekends only.Having visited a few times I wouldn't waste your time visiting unless you are real bored and have an hour to kill!
Ah yes, good point. I like Trentham, but a lot of that is what it offers a photographer. If you're into your primates though, it's well worth a visit. Albeit you won't be there too long!
Just a friendly piece of advice. When you reference another thread it is common courtesy to provide a link to it as so: http://www.zoochat.com/2/zooman-dec-8-day-uk-tour-429042/