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My guess is that Matthew's shift is from 16.00 to 18.00 CET and Yalda will do 18.00 CET to 21.00 CET. This way, all 4 main presenters will have 2 hour shifts on the UK feed, with Lucy and Yalda' losing an hour to national news.

My guess is that Yalda is in the mornings somewhere along the lines. Either 9-12 and not available today or something like 7-10 and therefore not on air due to the launch not having happened.
Ben Thompson getting something like 10-12 and the 14:30 WBR would be in line with what Sally Bundock has done in the early mornings the past couple of years and would be another way to reduce costs by removing the need for a business presenter.

Well, we will see her today, as Lucy announced, so today she will be 1800-2000 BST.

Given that she specializes in the Asian region (Middle East to South East Asia), one would assume her show will be during some of the Asian peak hours.