Cylindrical TicTac object at distance.Its size must have been very large, very bright white, so much so & stood out against the cloud

20th of April - Approx 4pm
Whist driving east towards Market Harborough, Leicestershire, UK on the A4304, I drove into a village called North Kilworth and I noticed in the distance behind the tree line was a white TicTac shaped object.
When compared to the actual sweet/candy, this TicTac shaped object was 1.5 to 2 times longer/length than an actual TicTac in it’s proportion of its height vs length.
I would estimate this object was at a 10-15% angle in the sky at probably 10 to 12 miles away (at least) in an eastward direction of Market Harborough & maybe beyond..?
At this distance, I would estimate this object was very large & hundreds of meters wide..
As I drove through the village my line of vision was obstructed by houses and trees, as I came through/cleared the village I could see the object again, it was a very bright, clean, gloss white in appearance.
Then all of a sudden this object very slowly, gradually and equally along its height disappeared into the cloud almost like it was reversing back into the cloud formation, the height of the object got thinner and thinner, equally as it disappeared.
Weather conditions on the day, the sky was completely overcast with white and grey cloud, there was no blue sky or sunshine breaking through. This object stood out very clearly due to its very bright/clean whiteness.
There is a local gliding club, but since my sighting and I have eliminated the fact that it could’ve been a glider or other aircraft. The object I saw was stationary & not moving, absolutely horizontal & looked nothing like a moving glider or any other aircraft I know of.