I dunno - I always assumed that London-proper prices (i.e., not Milton Keynes) being so outrageously high, upwards of £1,000,000, would throw out the average. Though perhaps the number of slightly cheaper apartments brings it back down again (although of course statistics can't tell you that's because the apartments are the size of a shoebox).

Plus as I understand it, a bit further north you could probably start getting a decent house for £300,000 or less. And in really out of the way places, under £150,000. Trying to talk about "average" house prices in most countries is generally a bit daft IMO because the range between "remote little country town" and "centre of the largest city" is vast.