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The broadcaster, 65, was taken to hospital after falling ill in camp after just four days, and announced on Thursday that he would not be rejoining the show.
Appearing on Good Morning Britain today - as a guest, not a host - Richard explained he puts the incident down to dehydration.
You can watch the clip below:
In the clip, Richard explained: "I knew I was feeling thirsty and I'm quite bad at remembering to drink, and as I snuggled into my sleeping bag and I was freezing, I thought 'I haven't had a big drink for a while... I'll do it when I wake up'.
"Next thing I knew I was sitting there babbling, talking nonsense. I basically woke up, didn't know where I was, what was going on, couldn't string a sentence together. As it turned out it was harmless, I had all the tests you could imagine and I got a clean bill of health."
Richard explained medical professionals were happy for him to return to the castle, but as he had broken the camp's covid secure bubble, he was unable to re-enter and continue his stint on the show.
Last week, we told you how the MailOnline reported that, because Richard’s exit was down to medical reasons and not from his own choice, he will still receive his full fee for taking part – alleged to be around £200,000.
ITV declined to comment when contacted by Tyla.
“Obviously I’m gutted to be leaving so soon but the safety of all the campmates is the number one priority. I’m incredibly excited to watch their journey continue…even more so at the prospect of being somewhere a little warmer than Gwrych Castle," Richard wrote on Twitter.
"Thank you to everyone who supported me on my brief but completely unforgettable adventure – I’ve made some great friends and honestly had the time of my life."
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