I agree with you that COVID has played havoc with planning for most operators but lets look at the bigger picture. It has already been pointed out that Wrights 70' plate registrations outstripped ADL but these chassis would have been placed pre-pandemic so this cannot be attributed to COVID. So what could have brought about the turnaround in orders?
There's a good reason why ADL have achieved a lot less orders than Wrights. However, it's late at night and I've already said enough - I'll let you folks join the dots.
And please note, this is only a hypothesis.
I think it is impossible to attribute a substantive part of the reduction in orders to anything other than Covid. The drop-off in orders is stark, even taking account of the fact that operator orders would probably have been somewhat reduced even without the Covid effect.
I've tried to crunch some numbers. They may not be exactly right, but broadly indicate double decker deliveries by Optare, Wrightbus and ADL for each of the last 5 calendar years to UK & ROI:
2017
ADL total D/D output 647
ADL integral output 524
Wrightbus total output 882
Wrightbus integral output 183 (inc. 110 NBFL)
Optare 1
2018
ADL total D/D output 678
ADL integral output 599
Wrightbus total output 523
Wrightbus integral output 182 (inc. 1 NBFL)
Optare 0;
2019
ADL total D/D output 694 (inc 40 BYD)
ADL integral output 466
Wrightbus total output 324 .
Wrightbus integral output 182
Optare 30
2020
ADL total D/D output 507 (inc 139 BYD)
ADL integral output 301
Wrightbus total output 234
Wrightbus integral output 196
Optare 35
2021
ADL total D/D output 239 (inc 52 BYD)
ADL integral output 121
Wrightbus total output 126
Wrightbus integral output 126
Optare 44
I've used the term integral where body and chassis are by the same manufacturer (accepting that isn't technically the correct usage). As such you could argue that BYD vehicles could be counted under the 'integral' heading given the nature of the partnership that exists between BYD & ADL.
ADLs integral output has consistently outstripped both Wright and Optare for every year but 2021 and even that was tight with Wrightbus and of course only represents a part year so far. If Wrightbus didn't have the Rotala order their numbers would look pretty dire.
Wrightbus's integral output has remained fairly consistent, but bodying others chassis has fallen off a cliff and historically this represented a major part of the order book.
I think technically there will be measures/metrics where both Wrightbus and ADL could claim to be "the UK's favourite double deck bus", but in all honesty that really just marketing fluff and operators will make their purchasing decisions based on other more meaningful factors.