Heart's share of listening remained unchanged at 6.1% from the second quarter of 2006, while Magic's dropped from 6.5% to 5.3% and Capital's went from 5% to 4.7%. Heart last occupied the top spot in the fourth quarter of 2005.
Capital, which kicked off its first advertising campaign following this Rajar period, continued to lose listeners. Its reach this quarter was 1.46m, down 11% on last quarter and 19% on a year ago.
Magic had been top in London for the first half of this year with a reach above 1.8m. However, over the last quarter, it lost more than 200,000 listeners, dropping 12.4% to 1.636m, while Heart added 50,000 to its audience to get 1.71m.
Steve Orchard, GCap Media's operations director, said: "In London, we have increased our reach and share and remain the number one commercial radio group. The plan for Capital's recovery is well under way."
BBC Radio 1 remains a thorn in the side for the top three commercial stations, coming in ahead of Capital again with a 5.3% share in London, down from 5.9% last quarter.
BBC Radio 4 underlined its dominance with a rise from in share from 13.1% to 16.1% and a 6.6% rise in reach to 2.43m, while Radio 2 increased its share from 10.7% to 11%, despite suffering a 7.5% drop in reach to 1.96m.
GCap's Classic FM was London's fourth most listened to commercial station, pushing from a 4.3% share to 4.5%, raising its reach to 1.4m up 9.6%.
Emap's Kiss, which relaunched at the beginning of September, lost 170,000 listeners to settle at 1.32m, and its share dropped from 4.4% to 3.8%.
Guardian Media Group-owned Smooth FM, which has applied to Ofcom to change its content format to allow it to target older listeners, registered a 1% share this quarter compared with 2.1% last quarter, and its reach is down from 537,000 to 445,000.
Chrysalis' talk station LBC pulled alongside Virgin Radio by increasing its share from 2.9% to 3.4%. Its reach picked up 25% from 476,000 to 594,000.
Virgin's reach increased by 3.1% to 1.11m but its share dropped from 3.6% to 3.4%. It outperformed its GCap-owned rival Xfm -- its share fell from 2.3% to 1.6% although its reach remained steady at 551,000.
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