My recipe is 4oz butter, 4oz sugar (i just use white), 2 tblsps golden syrup, all melted in the pan; then add seeds (handful of - I don't add fruit as I don't like it in flapjacks) and (supposed to be) 5oz oats but like you, I just shove them in the pan till it looks right. I usually make double this quantity. I then cook it on Gas 3 or 4 for about 25 mins until it's golden brown. This week it was on Gas 7 for 15 mins as it was in with the roast when I was cooking Yorkshire pudding. It doesn't seem to make much difference!!!

So it's all basically the same except I use more butter and sugar than you. I also cut it in the tin while it's still hot and don't spread it out too thin.

Mine is chewy with crunchy bits. NOT like shop-bought which is just bleh - much chewier than that.

Is it worth a) trying it with a bit more butter or b) making it in a smaller tin so it's slightly thicker/chewier?