Pretty sure its the Cocteau Twins, probably 'Pandora' from the album 'Treasure'.
Have the back catalogue so will have a listen and hopefully confirm. If you like it try with the album 'Four Calander Cafe' then 'Milk and Kisses' all these are great Cocteau albums and available on Amazon iTunes etc.
I emailed the post production company, Rushes, and got the following reply:
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The music is an original piece that was composed for this commercial so it only exists in the 30 sec length. It was created by a music company called Aardvark Music.
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