Posted: Today at 12:22
It looks as the pond adjoins paving so it may not be possible to fence it off. You could ask your local blacksmith to make you a six inch grid affixed to the paving and the wall. Perhaps a small section next to the paving that you can lift to get access to the plants - and the ability to scoop out the odd dead fish!
ponds and small children are a constant worry. When my neighbours had a baby I already was thinking about a lock on my gate to stop him in future years getting into my pond!
Apart from that your pond looks ok. Just cut down the dead stems, maybe take some of the plants out. Don't start feedping the fish until the water heats up. End march or April depending on where you are. Feed a couple of times a week then increase to daily as the weather warms. Use a floating pellet small size and you can the gauge how much to feed.