Films made in the UK contributed an estimated £4.3bn to the country's economy last year, research released by the UK Film Council has suggested.
Alnwick Castle doubled as Hogwarts School in the Harry Potter films
This came through tourism, employment and exports, and was up from £3.1bn in 2004, the organisation said.
That is a rise of 39% before inflation is taken into account.
Analysts Oxford Economics wrote the report for the UK Film Council, a government-funded body set up to promote the British film industry.
The report said 33,500 people were directly employed in the film industry in 2006.
And for every job directly supported by UK cinema, another post was filled indirectly - through areas such as merchandising or catering - it said.
About 10% of visitors to the UK may have booked their trips after seeing a film set in the country - although there was "limited robust statistical data" to back that up - it added.
Major UK-made releases in 2006 included The Queen, for which Dame Helen Mirren won the Oscar for best actress, and Casino Royale, the latter of which earned £55 million at the UK box office last year.
The council's chief executive, John Woodward, cited Britain's "world-class film facilities" plus its "phenomenal skills and talent" for its ability to attract so many productions.