How do I let the guests no they do not wear shoes in the home (British people please)?

Husband's family is coming from England soon. I notice when I am at their home in the Christmas they all are wearing shoes. I do not allow shoes in the house it makes too much dirt. Should I let them know before the time so they can have clean feet and good socks? I am worried they may have feet that smell... show more Husband's family is coming from England soon. I notice when I am at their home in the Christmas they all are wearing shoes. I do not allow shoes in the house it makes too much dirt. Should I let them know before the time so they can have clean feet and good socks? I am worried they may have feet that smell which is why the wear the shoes in the home. Is this common in England?
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