This will be Narrow-bordered Five-spot Burnet Zygaena lonicerae rather than Five spot Burnet, which is extinct in Essex (see Brian Goodey's 2004 Moths of Essex). In grasslands supporting good quantities of its food plants (e.g. Meadow Vetchling, clovers) and which are left uncut during its development and pupation, then it can certainly occur in good numbers - but anywhere in Essex supporting large populations in our modern degraded landscape is good!
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