It has nothing to do with being self-employed. It isn't income from your business. If it's taxable then it's taxable as 'miscellaneous income' rather than as a part of your self-employment.
A one-off survey payment of £50 just isn't of consequence, HMRC would not expect anybody to include it. Most people do not do a tax return and would not be expected to submit one for the sake of a £50 payment. On the other hand, if you're doing a lot of these surveys, and making a lot of money, then you perhaps do have a self-employment situation in respect of them.
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2016/17 Tax Returns 
2016/17 Tax Returns 
