Question: how many avios points do you need for silver membership?
Answer: There are three elite levels in the Executive Club program: Bronze, Silver and Gold. For Bronze, either fly BA twice and earn 300 Tier Points, or take 25 BA flights. To get Silver, either fly BA four times and earn 600 Tier Points or take 50 BA flights. To reach Gold, fly BA four times and earn 1,500 Tier Points.