One thing I forgot to mention about this bird. Don't expect it to be easy and approachable like one of those crazy released/escaped August pheasants. It acts like a wild bird, and it also appears to be very, very, very well-experienced with predators. The first view I had it was running at breakneck speed from a dog. In case you have a dog and wanted to take it with you, don't. That is a guaranteed failure.
In regards to weather, don't worry too much about that. It is so dark in that forest that it doesn't really matter what weather it is. The area is good for red kites as well, which sometimes circle very low over Manor Park