Stargazer, This is not about buying 'second home' though, its about investing in property rather than giving money to a pension fund that could fold. The stock market could crash, he could need the money in 20 years' time for emergencies and not be able to access it. - too many variables.
Investing in property or land is the better way forward. With his skills he could buy a small terrace to renovate and sell on, invest the profits into buying another and so on. Many self-employed tradesmen do this, it makes sense and as has been said on the thread already, he will not benefit from the Employer contribuions to a pension so would have to put a considerably amount down each month to get anywhere near a decent pension in at east 40 years' time.
Financial Advisers will not advise or suggest this as they will get no Commission!