Can anyone collect GCSE results on your behalf?

No, generally speaking, you cannot have someone else collect your GCSE results on your behalf. The awarding bodies and schools have strict procedures in place to verify the identity of the recipient to prevent fraud. They will typically require photo ID matching the name on the results. While some exceptions might exist in truly exceptional circumstances (e.g., serious illness), these are rare and would need to be arranged well in advance with the school or exam centre. It's best to plan to collect them yourself.