Correct.

Working with pressurisation was still a comparatively new thing then.

It was a great shame that more extensive testing wasn't carried out before they were put into service, but of course it's always easy to be wise in hindsight.

The British aircraft industry could have forged ahead, but instead, the 707 of Boeing was able to take the orders......and the rest is history.

Fortunately for them, our Sir Frank Whittle had created a jet engine for the Americans to use.