Join Date: Oct 2006
Location: London, UK
Programs: BA Gold, VS Silver, SQ Silver, IHG Plat Amb, Hilton Gold, Marriott Plat, Accor Silver, Radisson Prem
Posts: 16,872
It will be fine to go through security; a scooter is not designed to be a weapon.
If it fits within BA's hand baggage gauge, then it will be fine to take on board the aircraft in lieu of a cabin bag (or inside a cabin bag if it fits).