Yes! (Although you would need and adaptor for a UK plug.)
There are power sockets readily accessible for most seats. They on the riser from the floor between each seat of the row of seats in front.
They point at a 45 degree angle to the floor.
Here's a couple of images:
Socket:
This was taken with the camera touching the floor and pointing up slightly.
Location:
In the second image, the socket is located underneath a discernible straight part of the curve just above the image centre. (You cannot see the actual socket in the photo)
If you are on a bulkhead, the power sockets are at the front of your seat under the armrest and are only accessible when the TV screen is out and up.