Prince Harry joked about being delayed by the London Tube strikes during his Wednesday evening appearance at the Gherkin.
The Duke of Sussex, 40, was impacted by the industrial action taking place across Transport for London this week.
On Wednesday evening, Prince Harry left Clarence House after seeing his father, King Charles, to drive to the Gherkin for an Invictus Games reception.
However, his car was stuck in traffic due to the fact that no tube lines, apart from the Elizabeth line, were operating.
Prince Harry laughs off delay as Duke of Sussex impacted by London Tube strikes
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After arriving at the event, the father-of-two went on stage to deliver a speech, where he joked about the delay.
He said: "I think this whole thing has been delayed slightly, so at this point you're all hammered — which was part of the plan all along, stuck up here at the top of the Gherkin."
Earlier in the day, Prince Harry carried out an engagement at Imperial College London before travelling to see His Majesty.
The Duke paused to take selfies with fans, before saying: “I have to go, I’m so late… I’ve got to go, I’ve got to go. Nice to meet you guys.”
Prince Harry at the Invictus Games reception
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On Tuesday, Prince Harry travelled to Nottingham, where he announced a donation to Children in Need during a visit to the community recording studio in St Anns.
However, the 40-year-old arrived 45 minutes late, again due to the London Tube strikes, causing immense traffic.
If the Duke of Sussex were still a working royal, he would have the benefits that once came with official duties, including blue-light police escorts to speed him through traffic.
Unfortunately, these privileges are no longer automatically available for Prince Harry.
Prince Harry's reception took place at the Gherkin
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Prince Harry and Meghan Markle lost their right to automatic taxpayer-funded protection when they stopped being senior working royals
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Instead, his security was handled by private bodyguards, rather than police escorts.
Meanwhile, Archewell Foundation staff managed the media and crowds.
Prince Harry and Meghan Markle lost their right to automatic taxpayer-funded protection when they stopped being senior working royals.
The Duke of Sussex took legal action to challenge the Government's decision, but after a long, drawn-out legal battle, including with the Court of Appeal, he lost his case.