Pitiful shower pressure!
Discussion
If its an electric shower its f
ked.
If its a mixer shower straight from a combi, the valve is f
ked or blocked.
If its a mixer shower gravity fed from a storage cistern, the valve is buggered, blocked or the pipe work is air locked.
If its a mixer shower gravity fed from a storage cistern and boosted with a shower pump all of the above, plus the possibility of a buggered pump.
Check whether it is a thermostatic mixer valve, if so check it has been piped up correctly, hot to the left and cold to the right, as this can cause the thermostat to freak out and you will just get a dribble! Also make sure the valve is upside down!

If its a mixer shower straight from a combi, the valve is f

If its a mixer shower gravity fed from a storage cistern, the valve is buggered, blocked or the pipe work is air locked.
If its a mixer shower gravity fed from a storage cistern and boosted with a shower pump all of the above, plus the possibility of a buggered pump.
Check whether it is a thermostatic mixer valve, if so check it has been piped up correctly, hot to the left and cold to the right, as this can cause the thermostat to freak out and you will just get a dribble! Also make sure the valve is upside down!
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