Immediately after going on air, Capital Radio suffered co-channel interference from Radio Veronica, a pirate radio station off the coast of the Netherlands. Veronica began broadcasting in the 1960s and it was suggested that the allocation of 539 metres to ILR may have been an attempt to block reception of overseas broadcasts – a battle which preceded the launch of BBC Radio 1. Capital finally moved into office blocks in Euston Tower in September 1973, just a few yards away from Thames Television headquarters. Euston Tower was, at the time, London's tallest office tower.