This is the answer to your question this morning.

It takes two hours and fifteen minutes to go to London from Paris. The stations are Paris Nord and St Pancras.

Look at the pictures and you can dream to go there.

The second picture is the station you see when you arrive in London.

Now about the time :

Like most states in Europe, Summer (Daylight-Saving) Time is observed in France Time, where the time is shifted forward by 1 hour;  2 hours ahead of Greenwich Mean Time (GMT+2).

For exemple,  if it's 10 am in France it's 8 am in England. 

So if you leave at 10 french time you'll arrive at 10.15 english time.

It's in my opinion the best period of the year to go to England. The weather is often nice and the parks are beautiful. 

I hope you have a good trip if you go there and I can't wait to hear about it.