Your toilet can become a blocked toilet quite easily due to wipes amongst other foreign objects that are flushed down the toilet, if this problem arises the best way to deal with it is by:
No.1. Check the soilstack Drain outside is clear and free flowing by giving a gentle tap to listen for the difference of fullness.
No.2. Trace the soilstack from the blocked toilet to the nearest manhole Drain and make sure the Drain isn’t blocked, if all is free in the Drain which the blocked toilet waste goes into then
No.3. You have now determined the blockage is between the blocked toilet and the Drain outside, try to unblock with plunger, if all fails do not hesitate to call SOS Bradford Drainage.