I have a Kettler Alurad which I bought while in Germany in around 1981 and haven't ridden it for several years. I want to replace the tyres and tubes, but was surprised to find no tyres in that size at a large-ish Halfords bike department yesterday.
I've just checked online, and I could only find the Continental web site with tyres ("City Ride"😉 in that size.
Where can I get bog-standard, inexpensive tyres and tubes in the Maidenhead/Slough area? I only need the bike for going to the shops.