Looking for somewhere to buy replacement shelves for a 500 mm larder unit, the only places ive found either have a minimum spend of 100’s of £ or have to buy the entire carcass ?

B and q sell whiteboard and will cut it to size for you. Just pop into a shop. 5 mons and you are laughing.

Head to a wickes with a board cutting service and get them to cut down some 18mm furniture board. That assumes that your units arent made of solid oak or anything like that!

Ikea sell the shelves separately. Not sure if they still do 500mm units though. They used to and they do support legacy stuff for a certain period so you might have to ask.

As above, b&q sell the contiboard and will cut it to size for you.

Depressingly small difference between buying that and a complete base unit

If it were me I’d just cut some 12mm Ply to size and paint white. It’s inside the cupboard, so I don’t really care what it looks like..

I may have some spare as we ended up putting internal drawers in most of our 500mm units. Can check at weekend