When you work with British colleagues, expect that information is held back by default — not because people are being secretive, but because not sharing is simply the starting position. The British instinct is to keep things to themselves unless there is a clear reason to tell someone. This applies to personal matters, professional assessments, organizational knowledge, and opinions alike.
If you want information, you will generally need to ask for it, and even then you may get only what is directly relevant to your question. Do not interpret this as distrust or unfriendliness. It is how the system works.
The British do not volunteer information the way some cultures do, and expecting them to will lead to frustration. Adjust your expectations: if you have not been told something, it does not mean it is being hidden from you — it means no one has decided you need it yet.