Cost of fencing per metre

We had 250 mtrs x 1.2 mtr high green chain link fencing, with rough chestnut posts every 2 mtrs last year. Cost was 20Euro per mtr. Hope this helps.

Is the fence being inserted into the ground or within a boundary stone wall with the idea of adding height to the perimeter?

I can only speak for here (Sardinia). A 25metre roll of 2metre chain link retails at around €110. For the posts, in treated pine you are looking at something like €12 per post for ones of 2.5metres length. For a 25metre run you are going to need about 16, so cost of posts around €190. Total cost for 25metre run around €300 or €12 per metre. (no labour costs included or cement or whatever to secure posts in the ground). Hope that helps.