Could be steering bearings or tyres, as others have noted. I'd guess bearings. What do we win if we're right?

If it's "frightening" then I'd go with the steering head bearings first. Odd tyre behaviour is strange, but not usually frightening (at low speeds). You can adapt to it, learn and adjust to compensate. If it's scary at low speed it is much more likely to be bearings and not just in the steering, swingarm/suspension linkage play can have a serious negative effect on the steering behaviour too (as can fooked wheel bearings for that matter).

Fat chance! You've obviously never been to Norfolk then? ;)

stearing head bearings need lubing andcleaning every 9000 miles or so otherwise they stearing goes iffy just like you are discribing

not even close... :D c'mon we have good quality in Greece im sure you have better!

the tires cause problem only when you lean and more at high speeds!
if you have problem on low speeds then its 90% the bearings!!!
if they are not damaged yet you can clean & lube them!be careful when you put them back,don't over tighten the screw that holds the fork because you may have the same problem!!

i really think my En are bad!you improvise to understand what im talking about! LoL

Bike will be at workshop on saturday so we will know the cause on monday, tyres are not strangely rounded, they are ok, but steering feels normal when i swinged the handlebars right to left on slippery surface. I will tell you the guys.

Thanks for all those inputs

Turning the wheel on a slippery surface isn't really good enough to detect wear and/or corrosion in the steering head. The 'official' way is to get the wheel off the ground and remove all control cables & hydraulics which might interfere with free movement of the bars. The steering should then hold the straight ahead position, but flop slowly and evenly to either side with a gentle nudge of the bars. OK, no-one I know goes that far, but I would say getting the wheel off the ground is the minimum. The adjustment is very sensitive, and a problem big enough to cause handling issues could still be masked by the front tyre creating friction with the ground.

The issue is the bottom one of the head bearings.

As you slow for a corner/turn, the weight goes on to the front of the bike and if the bearing is dry it resist turning.

The natural response to this is to turn more, but counter steering effect work against you.

It feels very odd.

It is fairly straight forward to see how to dismantle and replace. May be tricky getting the bearing off and putting the new one on though.

I had this problem with my Sprint. The bearings were dry and rusted (usual problem, not greased enough at the factory) and the handling was horrible. It would tip into a corner and then go stiff, leading to bossing the bars around, over-correction, and 50-pencing all the corners. All fine control is lost, and in my case it led to my first drop in about 30 years, luckily at very low speed. It wasn't hard to fit new bearings, although getting the bottom race off the lower yoke was a bit of a challenge, and I ended up cutting it with a Dremel.

Personally, I found it affected handling far worse than worn or squared-off tyres. To be honest, it was actually dangerous, and I shouldn't have been riding it.

Has the bike suspension been lowered:ne1:.?