Just seen this message from a contractor that has staff working on TfL, luckily guidance can be ignored:
"You may have seen that TfL guidance in relation to face coverings has changed, and over the last week or so you may have seen new messaging across the network: Wear a face covering if it helps you travel with confidence. TfL are now encouraging staff and customers to take appropriate action to keep themselves safe – including using hand sanitiser and wearing a face covering if this helps them to travel and work with confidence
At (contractor) we are not changing our guidance, we still strongly recommend that (you) wear a face covering when on the TfL network, or any other transport network or busy enclosed space. The primary reason for diverging from TfL guidance is that cases are increasing, and we want / need to encourage you to work as safely as possible. We will keep our guidance under review over the coming weeks and months."