Got a Lidl one that’s too small and no guts, any recommendations for a more powerful bench (metal) grinder and one with polishing wheel too pfor occasional use in our workshop? Just something of a compromise i.e. better than the weedy Lidl one but not a big expensive industrial one etc. Cheers

Machine Mart: https://www.machinemart.co.uk/categories/?search=bench+grinder

Check the power rating, also check what you have currently for a reference point. Might want to check the duty cycle, polishing can take a while.