Buying decking boards

You get what you pay for. I have a 15 year old professionally fitted terrace where the teak wood gets Karchered twice a year, nothing else, and is still 100%.
I have some 1m x 1m Brico panels that are cracking up after four years.

@ PeterA - Brico seems to be half the price of the timber suppliers.

As wezembeekwanderer notes, you get what you pay for.

Softwoods, no matter how they're treated will be an extremely poor investment if you're planning to use them outdoors. It'll degrade rapidly in a year or two.

The answer is that, for use outdoors, NO price is worth paying for larch or other softwoods. You might as well just stand in the store tearing up Euro notes.

@ Petera, to answer your question; If you can get the same spec wood at Brico for half the price, then there is absolutely no reason not to buy it there.