Your shower can become a blocked shower quite easily due to a build up of hair and soap, if this problem arises the best way to deal with it is by:
No.1. Check under the blocked shower to make sure the shower trap is clear where the blocked shower Drains, if all is free under the blocked shower proceed to
No.2. Trace the waste pipe from the blocked shower to the outside Drain and make sure the Drain outside isn’t blocked, if all is free on the Drain which the blocked shower waste goes into then proceed to step
No.3. You have now determined the blockage is between the blocked Drain and the shower, try to unblock the shower using a plunger, if all fails do not hesitate to call your SOS Halifax Drainage.