At800, the organisation tasked with making sure viewers continue to receive Freeview when 4G services at 800 MHz are launched later this year, is holding another test at the end of the month.

Some 28,000 households in Brentford and Isleworth will be sent a free At800 filter ahead of the test, which begins on 29 April.

It follows a test last month in the West Midlands which At800 said resulted in fewer problems than anticipated.

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