At that height you’d need to be CAA registered to be flying it anyway
I don’t think so, not for non-paid work anyway:
Essentially, the person controlling a small UAS is fully responsible for the safe operation of any flight, but it is important to consider whether a permission (not a licence) from the CAA is needed.
You must request permission from the CAA if you plan to:
fly the aircraft on a commercial basis (i.e. conducting ‘aerial work’)
or
fly a camera/surveillance fitted aircraft within congested areas or closer (than the distances listed within Article 167) to people or properties (vehicles, vessels or structures) that are not under your control
Permission is not required if:
the aircraft will not be flown close to people or properties, and you will not get ‘valuable consideration’ (i.e. payment) from the flight, then a permission is not needed;
— http://www.caa.co.uk/default.aspx?catid=1995&pageid=16006