Hello Dave
Sorry that your trip has been cut short. You did look somewhat under the weather on Saturday morning. If its any consolation I felt somewhat similar on the Monday of our return, we thought like yourselves, it was the result of the dust, heat and in our case the claustrophobic atmosphere of the euro tunnel. A covid test proved to be positive. Like you I suspect there are many other cases.
However, it has not diminished our enjoyment of the rally.
Hope you are both feeling better soon.
Rob Jones