I like to to think in terms of beer purchasing power, which usually ends up somewhere between RPI and house prices.
A pint of beer in 1954 cost 9d, so with £2400 you could buy 64,000 pints if beer. To buy that quantity today you would need around £224,000.
By contrast, a litre of petrol in 1954 would have cost around a shilling so £2400 would have bought 48,000 litres. At today's prices: £48,000. I hadn't realised that petrol was so much cheaper now in real terms.