just in case you guys are interested heres an answer i got from ricambio re lowering springs-
the rear springs available are 15cm,17,19 or 21 in length, and the
price is aprox ?100 for a pair plus vat 17.5%. The price to send all these
parts including the front spring to you would be ?12. The total for
everything should be around the ?270 mark, not including any shocks.