The UK Border Agency says it's working with Northampton Borough Council to deal with camps set up by homeless migrants in the town. The latest encampment has been discovered on the site of the town's former power station
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Workers have announced six dates in June, July and August when they will strike.
A heavy police presence is expected ahead of a Britain First protest in this weekend.
Homeowners whose letterbox is either attached to a gate or on the outside of the property are warned they could be a victim of fraud.