Until very recently 90% of a fell race field would be wearing this shoe - the classic PB Elite Trainer.  Virtually unchanged for decades, they still represent one of the best choices on the market.  Slightly more cushioned than the racing version but still incredibly stable and low profiled, a great choice for longer races and training.  Some people find them too narrow and unforgiving when compared to modern equivelents, however this is exactly what makes them perform so well on the fell.  Size up small as do most walshes so maybe go up half a size on standard foot size if you haven't had them before.