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There is no fixed or set amount, it depends on a case by case basis. However, you may always try and negotiate for a higher offer than the £300 e.g. if you meet halfway, you may agree to settle on £1050 or so. Us lawyers have a saying, a bad settlement is better than no settlement.
It is always better to try and settle out of court as you may end up losing in court and incurring additional fees.
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