Richard J. wrote:

As I understand it, it's not a Bus Stop Clearway unless both the thick
yellow line and the timeplate are present, which at least makes it clear
to the driver that he mustn't stop there, though he may have to stop in
order to read the plate! The Highway Code is not very good on this, as
it mentions Bus Stop Clearways without saying how you recognise one
compared with an ordinary bus stop.

The ones in central Milton Keynes have a "Clearway No Stopping" and
X-in-circle shown on them. Most of the others don't, which suggests
they are actually shared-use laybys. It doesn't seem clear, though.

Nonetheless, it's helpful not to block a bus stop for any length of
time.

Neil