This is the Common Earwig, Forficula auricularia - they do not invade ears or wigs ;)
These can be found inside various crooks and crannies around widows and doors and may be drawn to the inside warmth as the days and nights get colder. They are harmless and will do no damage to yourself or your home.
Wiki pretty much has it covered, see here: http://en.wikipedia.org/wiki/Forficula_auricularia
You've been finding earwigs - common, harmless, omnivorous insects that prefer damp nooks and crannies to hide away in by day, eg. under stones, logs, in gardens, sheds, etc. Both sexes have those pincers at the back end, though in the female they are straight rather than curved. There are a few species in Britain - these look to me like the common earwig Forficula auricularia .
You can read more about them here: