Flapjacks - urgent!

[spring12365]

Sorry for the dramatic title... but does anyone have soup dragon's flapjack recipe. Some of the links have now expired and I am so confused as to which one to follow. Lots of people said the original, which I am guessing is like this https://www.thepinkwhisk.co.uk/2013/05/flapjack-bars.html, is unbearably sweet. Then soup dragon reduced the sugar in a second version, then one post said she thought she reduced it too much. Someone else did one third of the sugar... You get my drift! The thing is, I only have an 20 cm x 20 cm or 23 cm x 23 cm tin. Please could someone share the best flapjack recipe that will work in either one please (hoping to make this afternoon!).
Thank you.
@soupdragon

I use SoupDragon's recipe
250g porridge oats (the cheap type, not large ones),
150g Butter,
2 generous table spoons Golden Syrup
half a tin condensed milk,
100g demerera sugar
baking tin, no bigger than about 18cm x 28cm
Method: 1. Preheat the oven to 160 degrees c
Line the baking tin with baking parchment.
Melt the butter in a large saucepan over a medium heat and add the sugar and syrup. Keep gently heating and stirring until all is melted and mixed. If it starts to boil take it off the heat!
Add the condensed milk and mix. Bring to the boil for about a minute.
Remove from the heat and gradually add the oats, folding them in. All the oats should be coated, and the mixture quite dense, but still sticky. Don't add so many oats that the mixture becomes dry.
Pour the mixture into the tins and spread about so that it lines the tin to a depth of 2-3cm. Don't squash the mixture in, just spread it evenly.
Bake in the oven for about 15mins. You should take them out when they just start to go brown round the edges, don't leave longer than this. If they're still squidgy in the middle that's fine, they set on cooking.

You can substitute honey for the syrup and change the amount of sugar - I use less as they can turn out very sweet. I've also substituted some of the oats for assorted seeds and they're fab covered with a layer of chocolate.
They taste just like the soft gooey ones in M&S.

always on my phone. copied from the thread used all the time. thanks soupdragon 🙏🏽