Three Bettacare autoclose stairgates for sale - £5 each. Y spindles also available for fitting to wooden spindles on staircase. Stairgates can be secured by screwing/sticking onto walls so no drilling unless you want to!
Check out the bettacare website for more details. I think two of the gates are standard size while the third is narrow. http://www.bettacare.co.uk/acatalog/Aut ... sions.html
Call/text 07813840870 if interested.