How Much Does It Cost To Install Water Pressure Regulator How Do Increase The Pressure In My Shower?

How do increase the pressure in my shower? - how much does it cost to install water pressure regulator

I live in an apartment in the basement and has a very low water pressure in my shower, even though everyone seems very good. Since I am in the UK we have no flow-reducing shower heads, so no problem. A friend once said that installing a bomb somewhere and enormously helpful. No idea what might be and how much would it cost?