There are a few potential fixes you can attempt to improve the flow from your shower system.
Firstly, you can simply try cleaning the shower head, thus removing elements of dirt or grime that could be curtailing the flow to an extent.
Alternatively, you can replace the shower head with a new designer shower model, or install a shower pump or pressurised unvented cylinder.
Other options are to invest in an electric shower or a power shower which guarantee a stronger flow rate than that provided by your existing shower.
Our blog article, What Is A Power Shower, explains the advantages of this type of shower system in greater detail.