In reply to bpmclimb:
> This is imagining him somewhere like Bristol. Obviously if he ended up in Snowdonia the story would be very different, and ML might well be the priority qualification (but is there much call for lighting engineers for shows in Snowdonia?)
I'd say the exact opposite. There is far more ML (well at least DofE) work available all across the country, including around London and across the SW.
I don't know anyone working full-time (outside a climbing wall) as an SPA but I know numerous people working full-time off the back of their ML Summer and a DofE Assessor's ticket.
In fact you don't even need to get your ML, there is plenty of DofE expedition work available around London even if you just have WGL or BELA. It is the same all over - there are many times more kids from Avon and Somerset doing Bronze DofE expeditions in the Mendips than there will be kids going further afield to do Gold Expeditions or wanting to try rock climbing.
Unless you aim to work at a climbing wall, I'd recommend a paddling, walking, caving, sailing or mountain biking qualification over SPA in terms of employment prospects.