Halfords and AO.com say increases in employer national insurance will add to their costs

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British consumers face paying more for car repairs and new kitchen kit after retailers Halfords and AO.com warned on Tuesday that the autumn budget had increased their costs.

Halfords, the cycling and motoring retailer which has more than 12,000 employees, reported that the budget measures would add £23m of direct labour costs, of which £9m was already included in its planning assumptions.