Dude! That's what you call a mixed bag!
Really! It has a strange combination of awesome and worthless stuff. It has a lot of rare cardboard extras and cards. The cards are in German. Lots of figures, but none of the rares. The wings for the gargoyles are broken.
While the card pieces from the expansions are nice to have, you don't really need spares, so the fact that there are 6 fire walls is kinda irrelevant. Besides the selling point in the EU-exclusive expansions are mainly the minis which are missing.
All in all I wouldn't rate this lot very high. I'd say £ 60-70 is realistic (maybe he can push it to £100 if very lucky). He should definitely split this lot up and sell the pieces separate instead. But ~£430 is insane.