I'm back to work in London in a fortnight

[MadamFlutterby]

Where can I get adequate face coverings? I'm quite creative so have been able to sew a few washable cloth coverings which have served me well for regular supermarket shopping etc. However I feel I would need something a bit more substantial for commuting. A friend has a cambridge mask but their wait time is extraordinarily long - 3 months from what I can see. Looking for suggestions please.
Quite frankly I'm panicking a bit about the london commute.

If its any comfort, the trains are much quieter.

If you google FFP3 there's a few online pharmacies where you can order respirator masks. But these are only used in hospital when doing things like intubation that create aerosol. Most staff use fluid resistant surgical masks.

Of course, there's much lower risk on the bus/train than in hospital. And everyone will have face coverings preventing spread.