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My plan is to order triple-glazed Veluxes with solar control glass (you can get it on special order I think) then fit external solar shutters when we can afford them.
If your Velux are top pivoting, with a handle at the bottom, the support springs may be insufficient to hold up another pane.
If newish centre pivoting, with 24mm thick double glazed units, you could just order a tripple unit to your spec from a glazier. Would probably be a chunk cheaper than special order from Velux.
user69121
Fox
This is the answer, the Bartlett did a paper on overheating in London lofts which is very relevant to me and external shutters are by far the most effective solution (96% effective at reducing overheating degree hours), followed by night-purge ventilation, then solar control film:
https://discovery.ucl.ac.uk/id/eprint/10072870/1/Indoor%20overheating%20and%20mitigation%20of%20converted%20lofts%20in%20London.pdf
(page 15 has the ranking of passive cooling interventions)
My plan is to order triple-glazed Veluxes with solar control glass (you can get it on special order I think) then fit external solar shutters when we can afford them.
And also actually fit proper insulation to our loft which Dream Lofts who built it didn't do lol.
We cracked and bought a portable air conditioner for the hottest days (it was 30 in our bedroom on Friday night before I turned it on) but according to that paper if we do all the right things we should be ok with passive interventions until 2080 and I'll be dead by then.