An apartment which sold to a private buyer for an all-time UK record of £90m boosted figures for the entire London prime market.

The sale was made in April, and is the highest amount ever paid for a property in the UK outside a corporate structure.

There have been reports of sales of London penthouses for around £140m but these have been through corporates so the price is never listed on the Land Registry.

The property is located at luxury development 199 The Knightsbridge Apartments, overlooking Harrods, and has been purchased by radio mogul Ashley Tabor, who would have been given a bill for £13.5m in Stamp Duty.

Tabor runs radio business Global, owner of brands such as Classic FM, and has submitted planning documents to Westminster Council to knock through into his current flat next door, which he purchased for £15.2m in 2006.

It is not yet known which agent was involved in the transactions but firms such as Harrods Estates have previously sold in this block for up to £10m.

CBRE Residential is currently listing on Rightmove a two-bedroom apartment at the development for £6.5m.

London Central Portfolio said the single high-value transaction helped boost the prime central London sector in the second quarter of this year.

Property investment firm LCP said sales volumes in prime central London increased annually to the end of June by 4.8% to 3,885, while average prices were at £1.9m, up 7.9% on a quarterly basis.