Or which species isn't on the list but you think should be?
http://www.discoverwildlife.com/nationalspecies
http://www.discoverwildlife.com/nationalspecies
Badger again would be a bad choice if we start to cull them but maybe making it a national symbol would help save it. .
Fox,brown rat or maybe feral pigeon.
Both found in countryside and town, with population that reflect the UK landscape changes and mirror their human counter parts.
The UK countryside is virtually an irrelevance except for its tourist (inc day trippers) value. Tourism generates more money than farming does. So something to reflect the chances.
Had to be badger, oak, or otter. In the end I went for badger as adopting it makes the cull look even sillier than it is anyway.