Flat slab of wood - tabletop, shelf, etc (Stroud GL5)

Just seeing if anyone is in excess of a piece of timber which I can use to put some synths and effects units on, while using a keyboard stand. The ideal size would be around 120cm x 40-60cm, so I'm thinking a large shelf or perhaps a tabletop. As long as it's flat! Wood preferred, but would consider all options. Thanks! Alex