MBP #1 - 7200rpm issues - returned
MBP #2 - 7200rpm issues - returned
MBP #3 - 7200rpm issues - set up to be returned.
MBP #4 - Replacement order altered to 5400rpm drive, with credit of difference and a potential Apple good will gesture that might just cover the costs of sorting this mess out, but no more...
As advised on the Apple support thread, once you've called through the automated number to the returns section, ask to be put through to tier 2. Saved me half an hour, and eventually put through to a tier 2 manager (though not mentioning at the time her role).
So Tier 2 managers are either tight lipped or not knowing or both about the issue for Apple Operations Europe...
As a UK customer you've got consumer rights, rights associated with a credit card purchase, and the 14 day period that will basically cover you if you specifically request a replacement. Consumer rights for a MacBook Pro, are like other goods - it should be of satisfactory quality, as described, fit for purpose, and last a reasonable length of time.