In reply to TMM:
Salomon Ultra Pro. The best general purpose trail shoes that i have ever worn. Got me through UTMB with 100km still in my legs at the end (while other shoes let me down on other UTMB and similar races before). Generous toe box, holds ankle well on downhills. The major downside of this shoe is that it's not particularly waterproof. Based on your description, even with 'lots of mud' given the short distances you have in mind these will be very good unless the grass is very very wet. I run my training runs in snowdonia and liverpool in them with no issues.
if looking please look specifically for the salomon ultra pro - as of this writing AFAIK there are two colours available - the very rare all black and the more common red tops / blue heels.
there is also an s/lab version which is similar which has a rock plate. but, for most of us normal runners the ultra pro is probably a better shoe due to the increased stability.
with its large toe box, the ultra pro is quite different from most otherwise similarly named and similar looking shoe. well worth the effort to find.
Post edited at 10:08