jackie,
At least one of the 4 or 5 authorized labs (in the USA) doing the serum HER-2 tests has an office & lab in West London: Quest Diagnostics.
You may contact that office for info. Its web site iis:
http://www.questdiagnostics.com/uk/index.html
Good luck.
P.S.:
Based on what the front page of their web site seems to imply, the test for HER-2 may be done at their California lab called the Nichols Institute.
Even if this is the case it is not an obstacle for a UK resident, as frozen serum specimens packed in dry ice are standard shipping procedures allowing a transit time of up to one week.
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