Movies
It took over £8 million during its opening week, which was three times as much as nearest rival Saw V.
The only other new entry was Ricky Gervais's comedy vehicle Ghost Town, which debuts at four.
Last week's number one, the Coen brothers' Burn After Reading, slips to third.
The top ten in full:
1. (-) High School Musical 3 - £8,409,375
2. (-) Saw V - £2,436,817
3. (1) Burn After Reading - £1,433,536
4. (-) Ghost Town - £1,347,678
5. (2) Eagle Eye - £695,611
6. (3) Igor - £451,742
7. (4) The House Bunny - £305,197
8. (6) Taken - £260,342
9. (8) Mamma Mia! - £257,705
10. (5) Mirrors - £226,326
More: Movies, UK: Box Office Chart
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