You'd think that it would make sense for the boundaries between one "county"
and another to be moved from time to time to take account of any urban sprawl of a city on the
boundary, so as always to avoid splitting that city. The conurbation of Reading is split between
Reading, West Berkshire and Wokingham, when it would be much better for the boundary to be moved
so it runs through sparsely-populated areas between Reading and the surrounding villages. Likewise
for London - though where you (literally!) draw the line between London and its surroundings is a
more difficult one!

Ken Livingstone has suggested aligning the London boundary to the M25.

Initially Epsom, and several other peripheral districts, were intended to be part
of Greater London.