Specifically:
should surely read "fewer than 100 terrace tickets..."There are now less than 100 terrace tickets available
and
This is very vague, as it's quite obvious that the number of tickets available is limited, unless Burton's terrace either stretches out into infinity or else curls back in on itself via some sort of continuous loop, also invoking infinity. They need to be more specific. Maybe they mean "a small number of tickets", but even that is relative and doesn't really help the reader.Burton have made a limited number of additional seat tickets available