What charge do they use? I seem to recall another thread ending in a disagreement, and a certain degree of dissatisfaction the state of the law. I would be very interested to know what the pros charge.
Incidentally 10p is the difference between Burley park - Leeds and Headingley - Leeds. The evaded fare could easily be over £4. Times 5 days a week, most weeks of the year you get near £1000 that the honest commuters pay, is not spent on the line or more subsidy/less premium that the government could put to better use (yes, or less profit for the operator, but Serco who own half of Northern is owned mainly by pension funds, and the other half is owned by the Dutch (?) government).
ADDED
Just occured to me, you say 'block'. I assume you are just using the standard term and the block consists of a man with a ticket machine? How many people does it take to do a block on Burley Park?