NF,
Indeed it did - but TCAS will only work against co-operative traffic and most small microlights, gliders and ultralights have very small RCS signatures. Hence, in Class G Open FIR, does the DRR have enough sensitivity to detect these platforms at a range that permits the UAV to successfully avoid a collision? This is key. We can plan to fly the UAV only in CA (effectively segregated from non-cooperative aircraft) but if they suffer a power loss or are re-routed for weather, they may enter Class G. The CAA will need, under CAP 722, to be satisfied that the UAV has the equivalent detection of the lookout from an equivalent manned aircraft if it does so, or someone has to "own" the risk.