@ludo correct me if I am wrong but @Seasider I think you missed the point of the original post.
I don’t think this is about actually putting your gold in to a pension, but, as is the case with myself, saving in gold too to add to my savings portfolio come retirement.
My plan personally is to save as much as I reasonably can with my pension, I am lucky that my employer will match up to 12% so it is a no brainier really. As well as this save with an ISA, keep a pot of cash in case of emergencies in a generic savings account and also vary the portfolio with a sovereign every month or so, the reason being is that it is a very liquid asset and over time I hope (and believe) it will hold its value better than cash in a standard account.
The gold for me isn’t an investment as such and it certainly isn’t a get rich quick scheme, it is a rainy day fund that one day might help to buy cars, fridge freezers, a carpet etc.