I believe it is Hebe x franciscana variegata now called Hebe Silver Queen apparently! I cannot keep up with all these name changes! http://www.google.co.uk/search?q=He...NA_en-GB&redir_esc=&ei=8nvdTc-RComIhQet7MW3Dw http://www.perryhillnurseries.co.uk/Catalogue/Shrubs/Hebe.htm
Hebe is one of the very few plants with an opposite leaf arrangement where the leaves remain nearly identical in size as they progress down the stem. This feature is quite distinct and is what makes the plant appear so geometric.
