All landlords I know use the capital growth as the their main source of finance to grow their portfolio. They’ll purchase a property with a mortgage, then years later when it comes to remortgage, if the property has gone up in value, they’ll take out some equity and use that to fund their next purchase.
I’m guessing you might know this already, but as the original property isn’t sold there is no tax due when it’s revalued for the mortgage and the equity is released free of any tax.
That above strategy can be used if it’s in your own name or a limited company.
I do think in most cases a limited company is still the better option, but there is no tax dodge/loophole vs it being in a limited company over your own name like was mentioned previously. Pros & cons to both and one method is not always the best, it comes down to individual circumstances.