Lucky old Holland Park. Him of high waisted trouserage and brutal honesty in the 'will you make it in the pop game stakes', Mr Simon Cowell, has invested in another property in the area. The £40m des res in the making is apparently having an extensive underground extension built, which is what all the wealthies are doing these days, darlings. Whilst reports claim that it's all for swimming pools, spas and car parks we......