Two-week delay to honor Queen Elizabeth's death is too much. I think a day off as national mourning of Queen Elizabeth's death and everything will be back to normal. I know Queen Elizabeth's death is a very big event in England but Premier League clubs can't just postpone for two week because of that. The Champion League is ongoing, a tight schedule with matches from both Premier League and Champion League close or even overlapping with each other will be big trouble for England's clubs. They won't have enough time for players to rest or recover from injury and will lower the performance in both leagues.
I also just heard that the death of Queen Elizabeth will cause the postponement of the English Premier League match this week, reportedly the mourning period in England is for 12 days and obviously we will miss this week match, in my opinion, the organization of the Champions League will certainly coordinate with english clubs to find the right solution due to It's a mourning and I think it's very likely that English clubs may also experience delays from playing in the Champions League if they are at home, while for English teams that have away matches, it may not have much effect because they play in other countries.