It has an Excel task at the beginning, if you pass it they ask you to have an HR interview, a normal fit interview and then and then and then

Mental Maths and basic maths and algebra questions, market making questions followed by trivia on financial markets. They then asked if I had any questions for the company or people who worked there.

3 Rounds of telephone interviews focussed on probability and games. In particular, games involving coin flips were popular and having to come up with the optimal strategy for the game. They became progressively harder. I did not progress further than this.