I know for a fact my local stop at Milton Keynes Central has all of them in place still.
Here is a few photos where some of the signs can be seen.
Purple Zone Sign - Platform 6
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Gold Zone Sign - Platform 6
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Blue Zone Sign - Platform 5
2K12 1151 Milton Keynes Central to London Euston.
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Orange Zone Signs Platforms 3 & 6
1M11 1037 Glasgow Central to London Euston
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Why is there an orange zone, blue zone and purple zone, does anyone know?
At a guess, Gold Zone is definitely first class, right?