from thorsten at g-ladersiete.de we have the following offer
10 Pieces: 799,- EUR
15 Pieces: 759,- EUR
20 Pieces: 719,- EUR
roughly 15-18 euro each to ship
this includesvat
so for 20 = £638 ish (1.15 euro to pounds- all depends on exchange rate we get tbh)
if 1.19 like some places = £616