HALFWAY through her This Morning presenting debut last month, Sian Welby realised she’d made a rookie error!!

Her denim & Other Stories belted jumpsuit might have looked great on camera, but when you’re doing live TV and only have a three-minute advert break in which to dash to the loo, it was the most impractical item of clothing she could possibly chosen.

“I genuinely didn’t have time to wee!” she says.

“The belt was kind of stapled in and three minutes wouldn’t have been enough to run to the toilet, get out of the jumpsuit and get back in front of the cameras again.

“Rochelle Humes said that when she’s hosting and needs the loo, she literally counts the seconds from the start of the ad break as she runs out of the studio. As long as she’s done everything by 60 seconds, she knows she’s fine.

“But yeah, lesson learned. Easy-access trousers from now on!”

Jumpsuit slip-ups aside, Capital Breakfast host Siân’s week on the ITV daytime show was deemed a roaring success, with high praise from viewers, commentators and, reportedly, a very impressed This Morning editor Martin Frizell, who is said to “adore” her.

She also drew inevitable comparisons to former host Holly Willoughby, who quit the show in October last year after 14 years. But Sian, 37, is wary of reading too much into the “new Holly” headlines.

“I reckon if you stepped into any job where somebody had been there for years, you’d get comparisons.

“I’m obviously not offended by it because I love Holly, she’s an idol to me. I see it as a massive compliment! But at the same time, I don’t read anything into it. In showbusiness, you can’t overthink anything and I’m just grateful I got to do that week. I’d love to do more.”

Siân had already appeared on This Morning as a roving reporter and showbiz expert when bosses asked her last year if she fancied covering the main hosting role at some point.

Just a few weeks later, and before she’d really had a chance to get her head around it, she found herself standing next to Dermot O’Leary for the biggest moment of her career so far. It was sink or swim.