Well the last L1A1 scope which was sold via auction online post-refurbishment cost £2k (sterling). And that's just about the only one I've seen sold on there.
Re original magazine dukie, well I'm not sure if in general there were any L42 associating markings on them in general to show one definitely was with a sniper rifle, but I have seen a couple of the correct cr..xx marked ones sell for around the £200 mark lately.