Yep, I experienced this first hand with my old 4/4 a few years back, coming off the M3 onto a roundabout in the rain in heavy traffic....I think they were the original tyres and 20 years old. Luckily we both survived intact but needless to say they were all changed the next day (not the only thing that needed changing!) and it transformed the handling of the car.
I haven't had the Plus 8 that long and cosmetically the tyres look fine, but the previous owner hadn't exactly been racking up the miles in recent years and the lack of a date code has started the alarm bells ringing and I certainly don't want to repeat my 4/4 experience.
Old tyres are a real hidden disaster waiting to happen.
Especially as a lot of Morgans don't get driven much the tyres don't wear out very quickly and without the squidging effect when being used the rubber does not get chemically maintained properly and goes brittle.
Occasionally we see Morgans coming along to the sprint taster day with old tyres and as a result can be regularly seen pirouetting round corners.
The owners are really !! surprised at what impact old tyres have when pushed past the regular trundle.
Glad to see you have a new set and that National Tyres sorted you out so kindly.
