Spiky seedling in my antirrhinum tray. Northern England, UK

Does anyone know what this spiky imposter may be? I sowed all seeds from the same packet, but this seedling looks totally different to the rest, and grew well ahead of the others. I don't think its the same plant. Leaves and stem are both spiky.

I'm based in the UK and the supplier was Mr Fothergill's.

Thanks in advance.