Why do so few UK investors use covered calls?

Full disclosure: I run a training programme showing UK investors how to sell covered calls and cash-secured puts to generate extra income from stocks.

I've been investing this way for years and have found it a great way to generate decent income, reduce the risk of share ownership and make money in up, flat and even down markets.

If we were based in the US then this would be a well known and utilised strategy amongst income seeking investors but it seems to largely fly under the radar here in the UK. I've never really understood why especially as it is such an obvious extension for dividend-focused investors or indeed anyone who wants to lower the risk of buying shares outright.

Any thoughts?