Short answer:
YES
Explanation: Microlights operate under a Permit to Fly. Condition 1 states: The aeroplane shall not be flown for the purpose of public transport work or aerial work, other than aerial work consisting soley of the giving of instruction in flying.
So, if the flight includes other things - like a photo of their house - it is, technically, not possible for even an instructor to get paid.
Also, it is a trial "flying lesson" - known as trial flight or TF for short. Lesson = instructor.
Hope that helps,
ps. You can get a half share of the direct costs - ie fuel and landing fees, but not hangarage or insurance (if an annual premium, rather than pay-by-the-hour)