You can go large! like add a few crackers and three types of cheese..Red leicester is good one and maybe a bit of Stilton/Danish blue.. pork pie and others bits can be added..But you may end up with Christmas on a plate rather than a ploughman's
The simple ploughman's was originally for the workmen on a hot Summers day with a jug of scrumpy cider..
Now I am also thirsty..I think I need to go to bed, before I raid the cupboards..

(Thanks for this thread, brought some lovely memories back of me, my mom and dad, cycling through the Cotswold's..and stopping off at a pub for a ploughman's.. ah them were the days)