Trying to improve supply flow/pressure to a shower

[CPdiyer]

With regard to pressure my previous electric shower had a minimum pressure level of just under 1 bar and would trip easily especially at peak times even after modifications, so I am sure its around 1 bar.

There are a few pumps after some searching - I think Salamander obviously have the largest marketing budget

But a couple hundred against replacing the water supply (considering the previous owners built a garage on it) is worth a gamble.
If I tried to divert the supply I have gas and electric supply in the way - love this old house

 

[Terry lambert]

I've fitted a couple of Stuart turners

They will increase your current pressure by 1.6 bar and maintain 12 ltrs min

 

[picasso]

12 lpm is alright for one tap

https://www.youtube.com/watch?v=_yCKLhf4zFY

but if another tap is opened your back to having a crappy shower.