Shopping trolley wheels (Clerkenwell EC1R)

Hello neighbours,
I’m urgently looking for a pair of replacement wheels for a standard shopping trolley — the kind with click-on/click-off wheels and an axle bar.
My trolley is my mobility aid and I use it daily. One of the wheels has broken. I’ve done a DIY fix for now, but I’ll need proper replacement wheels as soon as possible to stay mobile and safe.
If anyone has:
    • an old, unused or broken trolley I could take parts from, or
    • knows where I might find free or affordable spare wheels locally,
I’d be incredibly grateful.
Thank you so much in advance for any help 🌟