A very common beetle found within the UK is that the Pterostichus Madidus or Rain Beetle/Strawberry Beetle. they’re a shiny, black wingless beetle and vary from ½ to 1” long.
These beetles square measure utterly harmless to humans and homes, however will accidently notice their manner inside and square measure typically miss-identified as cockroaches.
Our recommendation is to gather them up and place them back outside or provide Pest Control Hampshire a decision if you’re involved.