Many things could be the problem. If you have only recently had it, it might not be frost-hardy and we did have a frost the other night. Although evergreen, they do lose some leaves as a matter of course. Soil, whether in the ground or planted out could be too dry. As far as the scale insect is concerned then you could spray with a systemic insecticide but not if you are going to use the leaves for culinary purposes. I would be inclined to leave alone and perhaps give it a feed and wait and see what happens.

I need to see the condition of the Bay tree itself to make a proper assessment. I don't know how long these leaves have been detached from the mother plant. Does the whole plant look like this? If so, it's all over. It's natural for it to cast a few older leaves in the Spring. Is your Bay tree growing indoors or out? As Jimmy says, any number of factors could cause this. Can you post a pic of the actual Bay tree in question?

Hi Bath gate
Thanks for replying, oops I've already removed the brown and damaged leaves yesterday, they were the picture I sent. Its kept on my balcony in a corner in pot ,,,
I've also use slightly soapy water with cloth and cleaned every leaf to remove scales. (Took me some time)
Hope I haven't hurt it
Many thanks.

That must have been a tedious task, but it could have saved your tree. If the Bay tree is still in the same place in the same conditions, the next question is; how to prevent a recurrence?

Thanks for replying
Kellicarol