Gone are the days when a door was a single panel, hinged wooden affair. Now we have patio, French, conservatory, sliding; and of course- bi-

The increasing popularity of homeworking, the installation of bifold doors, sliding doors and garden offices, the changing seasons.

Halt! Friend or foe, you’re not coming in. Summer. Blue skies, barbecues, open windows and doors… and insects. However many legs they...