I'm not great with crickets (See Greek Cricket Team from Sept) but I think that these crickets are male and female of the same species. At first I thought that they were both late instars rather than adults but I am not completely sure. Please forgive me if you new this already.Best wishes Lewis.
Thanks Lewis - I should have taken more photos from different angles. I think that you are absolutely right that this one appears to be a male, and the other post has an ovipositor, so is female. Whether they are the same species I'd be interested to know.