Point 2: I really, really wouldn't tax rental profits at 40%. If you did that, then there would be a problem where landlords would be forced to sell up because of rising interest rates and not enough margin. You then have a rental housing stock shortage which will inturn drive up those who do choose to keep their properties rented out...at extortionately high prices.
Additionally because of the low housing stock on the rental market you can expect the quality of those homes to be lower as people will be expected to shoulder more burden or simply leave. In the mean time, where do people who have been kicked out live if they cannot afford to pay more for rent?
Point 5: If Point 2 exists in the same timeframe, I wouldn't sell up at all. I would convert to a multi residential letting opportunity and charge about £2k/unit/month.
Point 1: While doing renovations to my amazing second home to turn it into a multi-rent opportunity, I'd take it off the market. Once ready, I'd wait to value it based on an estate agent telling me when the best time to value is because of the new law of 2% rises and Point 2. Estate agents will hate this law too because valuing a property generates more commission for them, so they will be incentivised to help landlords maximise rates in the long-term.
Point 6: I'd lawfully offer my now extremely highly valued rental market property via an estate agent to my tenant at the inflated market rate, asking them to pay a huge sum of money to me (if they buy it, I walk away with a premium, if not I'll charge the next tenants who are desperate to live there because of Point 5.
Point 4: Negligible. Council Tax is nothing compared to interest on a mortgage and the 2% rent rise will cover that eventually.
I agree with Point 3, though :) Great mini-budget really enjoyed it :)