I would reconsider 'removing' the pond. You could break uo the bottom to give drainage and then fill it with good compost. Hey, you have a great raised bed for flowers.

I agree Bulbaholic, it could look lovely and the surround is already aged which would make it look so established when planted. Heathers could look good all year round?

put your potted plants on the wall, tile the bottom ,get your garden table and chairs in ,privet out of the breze while you drink your coffie and read your gardening mags and caterlodges,

Empty the pond of the water and the pond would be ideal for a raised flower bed or a raised vegetable plot.
You could add/put top soil in it