there are several ways of measuring inflation.
We used to have the RPI based on a basket of typical stuff the "average" family would buy
IIRC Thatcher's lot brought in a different measure which made things look better at the time.
Depending on which index suits them on the day, you hear politicians talking about CPI, RPI, RPI-X and Underlying Rate. They all do it, they're all crooks.
Housing costs are excluded

one effect of this is that massive Asset Price Inflation, like house prices doubling in 5 years, are not counted as inflationary
Unles you buy exactly the same mix of goods as the "typical basket" your personal rate of inflation will be lower or higher.
I've heard that Young People's perceived inflation is lower than Old People's perceived inflation, because MP3s, PCs, TVs, DVDs, Chinese sofas etc keep getting cheaper but water rates council tax, Werther's Originals, cat food keep getting dearer.
The ONS is quite capable of accurately measuring inflation by whatever scale they are told to, but politicians and newspapers will always bend the truth.
http://www.statistics.gov.uk/cci/nugget.asp?id=19