Please offer me a seat?

TFL as well as badges etc for mothers have started to do badges for Invisible disabilities something I do struggle with occasionally, namely I look fine but my walk is slow and I can loose my footing, particularly if in busy public transport, so I have one of these badges.

Wore it today on way to headway meeting which involves going on trains though rush hour, just to give me the confidence to sit in the disabled seats if I need to.