as far as i can read into this, it was not an 'Emergency Landing'. in fact, the quote from TCX in the newspaper states
A spokesman for the firm said the aircraft landed at Gatwick at about 0840 BST as a precautiony measure and all the people were taken off.
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so it was a precautionary landing, thus being able to land where they preferred, not where they 'Had To'.
come on Ppruneers, lets not get as bad as the media in hyping up & sensationalisation of non events..........