Double Extension Ladders made in the UK by Lyte ladders. NELT Aluminium trade ladders to BSEN131-2 for general trade use and NGD for Heavy Industrial work and frequent use. Reliable, strong and made in the UK. Lyte Double Aluminium Ladders are made to the new EN131-2 Professional standard. The new regulations require a stabiliser bar to be fitted, improved box section stiles and strengthened rungs.