Rocket launch or something else?

[Orange Smartie]

On the train to that London, I've just seen a con trail that appears to be going straight up. See photo below, taken near Beaconsfield. Rocket? Jet fighter?

Edit: maybe planes from RAF Northolt?

Edited November 5, 2021 by Orange Smartie

[Carbon Brush]

I see this sort of thing sometimes from my garden.
On a clear day, you can of course see for miles.
I have seen contrails low in the sky and then timed when they get overhead, when a passenger aircraft can be identifed.
A Boeing/Airbus/Whatever in the cruise tends to do 500-550mph.
The timing calculations showed they are often visible from 60/70 miles away.
These days it can be verified by flightradar 24 or similar.

In your picture the aircraft is too small to see, which means it is many miles away.

Supporting the idea of a distant view is the fact that different air temperature and humidity with altitude means you would not get a continuous contrail in near vertical (kerosene burning) flight.

 

Edited November 5, 2021 by Carbon Brush
Additional info.