I think it's a bit more than that. Stamp duty on a £300k house is like £2.5k. The same house would be selling for £340k now. You'd need to have saved another £4k (achievable in lockdown) as well an increasing your income by £8k (not so easy) to buy it today
13.4% increase in house prices YTD
I feel like my generation is fucked
https://www.bbc.co.uk/news/business-57648935