Ok, so I am useless at DIY and have no-one around who can help (although did pay a handyman to fit one that collapsed before I realised that it was too small anyway), but I'm not sure if any gate will fit.
My stairs are wide so thats probably why the handyman made such a bad job of it, although I did tell him that if properly safely fitted the red line wouldn't show and he still insisted that even with that there it was right. So my HV got me some gates and also extensions with them and even silly me managed to work them out and fit the extension onto the gate but they still don't fit.
\without the extension the gate is too narrow for the opening and with it, the gate is too wide. You don't seem to be able to adjust the extension. Has anyone else had this problem. Its a babydan one I've got. Can anyone suggest a gate that I can adjust properly. I have a baby and toddler and desperate for gates!