i would highly recommend this, if you are out and get a flat, infact keep it in you pushchair at all times, takes minutes to apply and lasted, this is it, but don't buy it from here, the 99p stores sell it for yes 99p 
www.ebay.co.uk/itm/MOBILITY-SCOOTER-INSTANT-PUNCTURE-REPAIR-/150685383594?pt=UK_Health_Beauty_Mobility_Disability_Medical_ET&hash=item23158c7baa