Married dad Glenn Hugill, 43, and Marina Berry, 28, also left their cars by a cottage - amid claims they share it during filming.
On Tuesday morning they were both seen with luggage outside a Bristol hotel. They put it in their separate motors and drove to the show’s nearby studios, where she is a production assistant.
They had arrived at the hotel the night before.
On Tuesday and Wednesday night The Sun saw their vehicles outside a cosy cottage in Flax Bourton, Somerset. A source on the Channel 4 quiz claimed the millionaire dad of two and Marina - on X Factor in 2009 with girl group Miss Fitz - were often there.
Saucy tweets have deepened the mystery.
OfficialBanker, verified by Twitter as the show’s authentic account, wrote last year: “Happy Valentine’s Day honey x.” User Marina_Berry, an account with Marina’s photos and a link to an online profile of her, replied: “Happy Valentines to you too, sexy beast.”
And in April she tweeted: “I love you, you beast. You’re like a wolf but sexier and with a deeper growl X.”
Glenn - who lives with wife Emma, 36, in Kingston, Surrey - found fame in the 1990s as Corrie cop Alan McKenna, boyfriend of hairdresser Fiona, played by Angela Griffin.
The £315 Bristol hotel suite was booked in his name - and staff confirmed a man had checked in.
Yet engaged Marina insisted she made the booking, stayed alone and Glenn arrived only the next day. She added: “I absolutely deny we’re anything but good friends.”
Glenn scotched suggestions of a romance as “absurd”. He said he paid the hotel bill “as a favour to a friend and carried some things for her, then we drove to the studio”.
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