Could there be a coup in the UK?

It is very hard to imagine a successful military coup in the U.K. Even when the country suffered from a weak economy (in the late 1960s and also in the mid 1970s) there was no coup. There were stories to the effect that some people had talked in terms of a coup, but there is no real evidence. A coup can usually only succeed if the civil service and others are prepared to co-operate.