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no, defo not agapanthus, i have two and am familiar with them. this shrub has many branches, like a small tree, but very black. have just driven past the house but couldn't really see much from the car. will have to knock next time i walk past just to satisfy my curiosity...and put you lot out of your misery too :)
nothing that i google comes up with anything remotely like it, it's really stunning in it's colour scheme and the lovely lantern shaped flowers/seed pods. almost like a bleeding heart plant but much bigger and more shrub like, and obviously a completely different colour.
webbo, it will be interesting to hear what your colleagues at the garden centre think.