Please seek professional advice before making any decisions.
Regarding property investment:
An HMO could be a good option if you have experience in property development and strong contact and relationships with tradespeople - will save you a lot of money and headaches.
As for Airbnb, I would advise caution unless you can secure a property located in a prime area with consistent visitor traffic and a strong local economy that creates demand for temporary accommodation year round (contractors, local authorities, locum doctors, etc.). The market for Airbnb rentals has become quite saturated, and not as profitable as influencers on social media make them out to be. Many are simply trying to sell courses.
On figures:
Consult a professional first.
I don't know how old you are, but given you said you don't need the money soon. You might consider lending your LTD Company the £200,000 with interest, and then having it repaid over a period, example say 15 years. You would be liable for tax on the interest earned, but please fact-check this and do not take it as professional advice.
If I were to pursue this strategy, I would focus on BTL properties in an up-and-coming city/Town with relatively low property values. Building a small portfolio of say 4 properties with decent deposits and low mortgage repayments
Recoupyour initial £250,000 instead of taking a salary over the agreed period, while building equity. You can pass the properties on or exit the market.