Cheers.Try going down one side of it to check the thickness before getting someone in. If it's really thick or even worse reinforced (if it was a garage base for instance) then it'll cost a fortune to get removed.
What's your plan on what's going on top? If it's just to turf it then leave it and just bring up the soil level (maybe a layer of gravel or sand infill first), it won't do any harm. If it's too costly to remove and you're going to plant on top, then is a raised planting bed a possibility? If the level it's at is OK then maybe some nice outdoor tiling with a seating area or big pots?
I managed to get down one side and also chip it off with a sledge. It's about 2 inches thick and didn't seem too tough. I reckon I'll have it broken up, I'll get a quote, it seems to be sand and rubble underneath so I might even get the top 6 inches dug away?
Two working plans;
1. Remove concrete, dig up top 6 inches and put down 10 inches of soil and turf it. Then over time nice border plants etc.
2. Chip some holes in the concrete and build up raised beds around those holes. Everywhere else either fill with more concrete and top with pebbles or....[insert idea I haven't thought of]
Ignore the tiles/flags in the image, they'll all get binned off