Motorists from England face being turned back at the Border if Boris Johnson eases lockdown restrictions before Nicola Sturgeon.The two leaders were last night on a collision course over whether it would be safe to relax measures to curb the spread of Covid-19.Now, a senior police officer said the force would have to take action if Scotland had different rules on movement to the rest of the UK.Yesterday, First Minister Sturgeon announced three more weeks of lockdown for Scotland - but it has been widely reported that Prime Minister Johnson could allow more freedoms by Monday.This means daytrippers and holidaymakers could be tempted to head north.But a senior officer with Police Scotland told the Record motorists would be stopped from