Yet another onion set thread

Last year many of my cheapo (poundland) onion sets bolted. The seed sown ones, whilst smaller, didn't.  I'm planning on sowing some seed onions today to give them a bit longer growing period than last year.

I noticed D T Brown advertising heat treated sets at an eye-watering price compared to Poundland or Home Bargains.  What's the team think of heat treated onion sets and have you used them to advantage.  TBH no matter the advantage I can't see me forking out £9.70 for 160 ish sets plus p&p when I can get the equivalent for a couple of quid. Plus I don't need 160.

As I understand it, Heat treated onion sets are less liable to bolting than non-treated sets. Having rarely grown any sort of inion that was much bigger than a set, I'm not the best person to advise you!

The main culprits for bolting are the red ones! This has always been true as I tried some last year thinking they may have gotten their act together after over 20 years of selling them they haven't!  I have now given up on red onions from sets,but prefer the torpedo shaped red onions grown from seed anyway.

Normal sets are easy and cheap. I can usually bargain for about 10% of them bolting, which I can live with!

I haven't tried heat treated sets as they are stupidly expensive and the extra price  would not cover the 10% expected loss?

What nmassively boosts the price up is the delivery charges, hence the reason I have already purchased my 100 x Centurian F1 onion set at a bargain delivery price of £1.30!