Ground floor sockets not working except main one connected to fan oven

Not really enough info as too many options to go through. Is it an RCD that's tripped? If so, then switch off all MCB's served by the RCD and reset the RCD switch MCB's back on one at a time and if it trips for one of them, you will have isolated the problem circuit. Disconnect all on this circuit (if lighting take out bulbs) and try to reset. If reset is successful, reconnect appliances/bulbs till one causes trip if so you have isolated individual problem. If reset is not successful call in an electrician to locate fault with test equipment. Kevin.

yes it sounds as if your circuit for the sockets has tripped, this is reset at the consumer board which should be close to your electric meter - flip the switch to reactivate; if it refuses to stay on then there is a problem on the circuit, unplug all sockets and try again, if fails again then call electrician to check all sockets (maybe a loose wire earthing) Your socket point to the fan oven will work as its on a separate electric cable feed and circuit.