By Laura McGuire Halfords has issued another profit warning as the cycling and motoring retailer continues to be impacted by a “weakening” demand for its goods. Today, the London-listed retailer said it expects profit before tax for the full year to be in the range of £35-40m. This is lower than its previously reduced guidance of between £48m and £53m. Halfords board said: “Whilst we have reduced our profit guidance as a result of very challenging and exceptional short-term market conditions, we remain confident in our strategy and longer-term growth prospects.” “When our core markets recover,…