Yeah, my 2006 Hwak STi is covered with one of these and I have a mate who used for work for subaru.
The struts aren't covered I don't believe, but the garage might cover it for you under the Sale of Goods Act. In effect there's double cover, the Subaru Warranty and the place you got it from.
If you cut the place a deal, they might help you out: "If I put in £200 for the diag of the issue and some of the parts, will you pay for the rest of the work?" Dingles in Norwich were excellent to me when I thought I needed to make a claim.
Goes without saying... but if someone knows better I'm happy to stand corrected :-)