Carpet underlay roll, unused (Horspath OX33)

I have a roll of unused carpet underlay still in the original packaging, possibly a good few years old. Width is approx 135cm by "probably quite long" but my ability to remember maths, pye and circumferences etc are long gone. It's the rubbery/foam type underlay. Collection from Horspath on weekdays in the mornings between 8.30 and 1pm