Old decking & climbing frame beams for burning (Peachcroft OX14)

I've replaced some decking that was getting rotten and dismantled a climbing frame. Please collect the wood if you can use it for burning:

Decking - about 25 sections that are cut up to be circa 50cm long. The decking was obviously originally pressure treated and has since been stained or painted by myself a number of times over the years. I've used standard B&Q wood stain or exterior paint, much of which is now worn off but don't know how any chemicals may have seeped into the wood.

Wooden frame - about 20 sections cut to lengths between 80 & 120cm, mostly 7cm x 7cm (3" x 3") square sections. This came as pressure treated (to survive outside) and has never been painted or stained by myself since. Most of the metal fixings have been removed but some remain.