Was going to post the exact same thing.
Noticed this yesterday, that the estimated delivery times were showing as ship today, delivery on or before Friday for RM24 (1st class post)

Have checked again today and the same item shows as delivery as below if they ordered it now, after our eBay set cut off time for posting today

How is it so difficult for eBay to factor in the strike days...

I asked eBay to call me yesterday on my other account and spoken with 2 colleagues. The first didn't have a clue and was unhelpful, called Leah perhaps
Eventually got transferred to a Oliver from the leadership team, was uninterested in getting it solved and said he would not do anything today about it (last night)
He also added that it didn't really matter anyway as there are seller protections for defect for late shipping and late delivery and we are protected for INR cases, etc.

 He was more focussed on insisting I was rude and didn't care why. If eBay even tried to do their jobs properly, I wouldn't have had to waste an hour on the phone explaining it to someone whom clearly couldn't care less if they tried.

eBay and eBay alone are responsible for estimated delivery times. Sellers are responsible for handling times.

If the buyer experience is so important, why do eBay seem to care so little about it?
As sellers, we know the drill and stick to what we say, post items on time, with the service chosen by the buyer and we always get all of the blame all of the time when items arrive late. We are doing nothing wrong and are valued at ZERO in these cases.

Just had an email from Royal Mail confirming strike action tomorrow and Friday, as below:

We're sorry to advise that due to strike action taken by members of the Communication Workers Union (CWU), we'll be unable to provide a business collection service from you on Thursday 24, Friday 25, Wednesday 30 November and
Thursday 1 December.

Royal Mail Customer Service Points will be closed on the days of strike action. Limited resources mean there will not be alternative drop-off points for large volumes of parcels and letters. Please do not drop off items on strike days or the days following strike action.

We'll resume collections the next working day after industrial action. We'll collect as much mail as we can from you. We may need to collect additional mail volumes over several days if you have significantly more volume. Please note additional collections are unavailable following strike days. There could be minor changes to collection times because we may have to collect more items than usual.

Please check Royal Mail Latest News for more detailed information on our services.

We'll return services to normal as quickly as possible. We apologise for any inconvenience and thank you for your understanding.

Kind regards,

Royal Mail Customer Services

So they are on strike and eBay are still telling buyers stuff will arrive that can't even be posted...

Regards

Russ