We get a lot of these sort of posts on the forums.... I've participated in market research / studies before - but these have been attached to a race, so maybe think about approaching a Race Director and ask if you can aproach participants to help out in your survey.
If you can give something back, e.g. Volunteer at the race then all the better, then you can actually meet and see the runners.
Easy - no... It goes up the Taff Trail, so you head out on the canal from Brecon and then up alongside the Talybont reservoir before dropping down to meet the Roman Run route, (about 9 miles in) there's two possible routes to the reservoir, on road or along the canal to Talybont... The old Ultrarace 50 went on the road but the canal route is nicer
It depends what the weather's like. I've done Fellsman twice and got a case of mild frostnip in 2012...! It took nearly a year before my fingers were back to normal, and I still have issues with them in the cold now.
Since then, I've used mittens with silk liner gloves underneath if it's really cold. I've never had any luck with waterproof gloves - they always seem to get wet through eventually. I have a variety of mittens, from thin ones to full-on snowboarding gauntlets
The biggest revelation was wearing fleecy/thermal arm-warmers. Keeping the blood warm on the way to your hands, (especially at the wrist area) helps keep the fingers warm too.