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Today I issued Apple UK with a final Letter Before Action regarding the keyboard issues primarily, and display damage from overheating in clamshell mode secondarily. Thirdly I wish to avoid the warranty time-bomb - I don't want to pay £700 every few months for a complete top case replacement.

Citizens Advice Bureau and Consumer Advice have been helpful thus far.
 
As others are saying, I would personally buy and install an SSD yourself. You will get a much faster computer and you won't have to deal with trying to argue your case in the courts.
 
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