Start with the room, not the bed. Many of London's older homes near Wortley Village and Old North have narrower staircases, tighter doorways, and bedrooms that were never sized for a boxy adjustable base. Before you fall for a model, measure the doorway, the turn at the top of the stairs, and the floor space around the bed so your parent can get in and out safely on both sides. Newer condos and bungalows in Byron or Masonville usually give you more room to work with, but always check that the base clears baseboard heaters and floor vents.
Prioritize the things that matter as mobility changes. Look for head and foot articulation with easy presets, a weight capacity that comfortably suits your parent, and confirmed mattress compatibility so the mattress you buy actually flexes with the base. A wireless remote with large buttons helps arthritic hands, and battery backup is worth it here; London gets ice storms and the odd summer outage, and you don't want a bed stuck upright when the power drops. Ask the retailer about warranty length, who handles service calls, and how fast they respond, because a motor or remote can fail years down the road.
We'd steer you toward a local London retailer that delivers, assembles, and hauls away the old bed over an online-only deal that ships a heavy base to your porch. The online price often looks better, and honestly, it sometimes is. But a local team that carries the base upstairs, sets the height, and shows your parent the remote in person is worth paying a bit more for. The trade-off is a smaller selection and possibly a higher sticker price than the big online sellers. In our experience, that hands-on setup pays off the first time something needs adjusting or fixing.