SIR – In 53 years I’d never seen a snail in Bradford, not one! Add ten years and you can’t move for them, cracking and oozing under a damp nights’ footfall.

You may throw them as far as you like, but unless you’re one of the many folk who’ve concreted over their garden space, there’s always plenty more hiding, waiting.

It’s bad enough being hundreds of feet up in the inclement Pennines, but now there’s no chance of growing anything worthwhile.

Has anyone any clues as to how this has happened? Global warming effect perhaps, transference of the blighters with sand and aggregates from building projects?

Is the Council aware of this immigrant horde and what is to be done with them?

Kenneth Lockwood, High House Road, Bradford