Planning permission - earth mound

Hi - anyone got a link which will tell me at what point an earth mound stops being "landscaping" and requires planning permission? we are a primary school trying to build a large three quarter circle earth mound - low (1.5m) but large (5m diameter/30m long) to use as an ampitheatre / venue for children's productions.
Russell
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Your best bet is to go and talk to your local planners. They are usually quite helpful if asked politely. Now put head back in bunker!
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