Yes I’m a qualified accountant (but works in finance/investment banking in London ie what Ali has recently tried to emulate or Lydia has forced him to cosplay in his wierd ‘old money office’ and attire LOL. Both honestly make me laugh - all show, no substance or brain matter).
In principal - costs incurred from activities directly related to their work (ie being a prancing social media horse) can be deemed a tax deductible expense to their income earned. So yes, if they vlog any of their “holidays” and include ads/sponsorships in the holiday like this wedding trip to Italy - they’re basically working - and any incurred costs on that holiday can be deemed as a tax deductible expense in her incorporated company (ie she saves money by paying less corporation tax). This also goes for any of her house renovations - as this forms part of her activities as a social media horse about being ‘an old country grandmother’.
They may not have been aware of this strategy initially - and likely if she has a financial planner/accountant managing her company’s accounts. They have advised her this strategy when setting up a company - ie. Monetise all aspects of your personal life, by vlogging everything, where possible get sponsorships/ads, so all production costs and anything mentioned of the vlog can be fully expensed/tax deductible.
It’s a good financial strategy for their current situation being social media ponies - but definitely not a long term financial situation to be in. I don’t see them having the same gravitas or relevance with any following when they are in their 40s or 50s (which is only 5 years away!) - it won’t be financially sustainable. Will be entertaining to watch though and I’m here for it lol