I had to state that Thomson knew about the change of plane because they refunded me the premium upgrade for the return flight when I flew out overseas. Over to Thomson for their comments which followed by some silence...... end of matter.
Mark

As under the Montreal Convention, obligations on operating
air carriers should be limited or excluded in cases
where an event has been caused by extraordinary
circumstances which could not have been avoided even
if all reasonable measures had been taken. Such circumstances
may, in particular, occur in cases of political
instability, meteorological conditions incompatible with
the operation of the flight concerned, security risks,
unexpected flight safety shortcomings and strikes that
affect the operation of an operating air carrier.
Extraordinary circumstances should be deemed to exist
where the impact of an air traffic management decision
in relation to a particular aircraft on a particular day
gives rise to a long delay, an overnight delay, or the
cancellation of one or more flights by that aircraft, even
though all reasonable measures had been taken by the
air carrier concerned to avoid the delays or cancellations.
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