I see that it has a front sight protector. Cant really make it out well from images, would be worth getting a close up of it. The second variant of the BSA front sight protectors are worth over £100 on their own (I have two). If it was the first variant, it would be more. As for the rifle, it looks pretty standard. A bit of speckling, so Im gonna stick to my first estimate (£110 to £150). Nice rifles, lots of them were made and the S prefix are the more common ones from what I have seen. Great shooter though, built to last.