For anyone interested in getting really close to some big animals i would recommend going on a half day safari with these people.
http://www.photographersonsafari.com/pages/woburn.htmI'm have a spinal cord injury which confins me to a wheelchair, but John who organises these trips could not have been more helpful. The landrover picked me up from my car in the car park and John even pushed me round the Lemur enclosure at the end.
A fantastic day out!