Different expert here - Welcome. My name is Barbara, and I will be happy to assist you with your tax question.
I have researched your concerns and am in agreement with the first expert, but would caution you to keep meticulous records as to your expenses, i.e., business v. personal. You mention that you will incur these expenses during the 5 months of ski season. HMRC provides the following:
"If you're self-employed there are various reliefs, allowances and expenses you can claim to reduce your tax bill. You can take away from your business income various running costs and expenses associated with your business to work out your profits - but you can't take away any private expenses. And you can claim special reliefs for certain "capital items" - one-off costs to buy or improve an asset you keep and use for your business."
My point of reference is the following which contains excellent information:
Once again, I would caution you to keep meticulous records of business v. personal expenses as well as pertinent receipts, logs, etc. to justify your position.
Please let me know if I can assist you further.
Thank you and best regards,