Hi
@landlord
My take is bit more nuanced than that.
I think investment trusts (which are taxed under the usual income tax/CGT regime) are a good option for somebody with a low marginal tax rate. For example, a retired person living on the State Contributory pension who receives a substantial inheritance.
I don't think I've ever recommended that anybody invests outside a pension wrapper while carrying a mortgage - even a cheap tracker.
If somebody has a paid for house and is maxing out their pension contributions, then investment trusts might well be a good home for their after-tax savings.
However, most people in that scenario would typically be pretty well advanced in their career and may well be thinking about de-risking their portfolio in the run up to retirement. My suggestion in those circumstances is to maintain a high equity allocation in the pension wrapper and use after-tax savings to buy (tax-free) State savings products.
Hopefully that all makes sense.