Possibly a Lesser Marsh Grasshopper?
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Again, great photo. The keels on the pronotum, i.e. the lines behind the head are very straight, not curved in. And Meadow Grasshopper females usually would have short wings. If you are interested Evans & Edmondson's book has a great picture key in it, very useful to navigate through grasshopper trickiness!
Lat/Lng: 51.4767, -0.2347
OS grid ref: TQ226767
WWT London Wetland Center