Shirokuma, places like Burford, Whipsnade, Banham and Port Lympne are why I learned to drive!!
Seriously, apart from a handful of places like London, Bristol and Edinburgh, zoo visiting in the UK is extremely time consuming by public transport. I used to live in Upminster, and to get to Whipsnade by tube, train and bus would never take less than three hours. By car round the M25/M1 it took maybe 75 minutes.
Multiply the difference by two and that's three and a half hours' extra time to admire Indian rhinos, hippos and wolverines!