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You are all about the toupret, are you on commission? ;) Used toupret in france on your advice, worked well.
Edit: you should be on zinsser commission, used the stain blocker and you were right. Others I usef, claimed much but the stain marks came through.
Have used easy fill or similar?
lynx-
It just comes from years of having limited access to properties to fix problems so you need the materials to work. If the filler shrinks or sags on a job when you're only on site for 2 days you can end up with a lot of timing problems. Zinsser is reliable too. I have looked for UK based alternatives but not found anything as good yet.
Easy fill is very popular with plasterers, its a joint filler for plasterboard. Very soft and easy to feather with a sponge but you need to be very careful to prime it. It's prone to making very fine bubbles in the paint. It's supposed to work well under multi finish plaster.
Toupret TX110 for example sets at different rates depending on the temperature of the water you mix with it. Very useful some days.
Another product which is very useful is Multi Solve, made by the people who make CT1 which is also very popular with tradesmen. That and the Everbuild multi wipes.
I understand that it all adds up if you are just doing some diy. I use a mixture of what's hanging around on my own diy jobs, my hallway has been half painted for 15 years though!
Airhead
Toupret are my go to because time is money and they always work a bit better than expected (especially if you read instructions). I'm sure there are lots of decent ones but I've been using Toupret so long I don't know much about the options.
I've also started routinely painting filler patches with Gardz from Zinsser before emulsion and that has made some really brutal chasing patches disappear.