The dark bush-cricket (Pholidoptera griseoaptera) is easy to identify as it is our only all brown bush-cricket. The other brown bush-crickets we have in this country have some white and green on them, are much smaller, are far less common and tend to be found in specialist habitats where the 'dark' does not occur. That said, the colouring can vary from a chestnut colour to almost black, the female usually paler than the male although this female I photographed is pretty dark in colour.
This insect can be found in any rough vegetation such as hedgerows, woodland scrub, roadside verges and quite often in garden shrubberies. They are quite common in these habitats and are one of the most frequently seen bush-crickets. There are adult insects about from July until the colder nights come in October or November.
They do not really 'sing', making a single high pitched squeak repeated intermittently. They do 'sing' by day but are far more active in the evening and if you have young ears you can quite clearly hear them.