Low hot water pressure in new kitchen sink

Hi

there,

I’ve recently just fitted a new kitchen in a flat in sheltered accommodation. The previous sink had 2 pillar

taps for hot & cold water, and i have replaced this with a sink with

just one tap which is a mixer and came as a

pack. However the hot water pressure has reduced quite a bit, even when only the hot water is turned on, and i need the

cheapest solution

to remedy this.
The hot water itself comes from an electric heated cylinder tank which is only 6

or 7 feet above the tap, and runs through 15mm pipes. As you can imagine the pressure wasn’t amazing

before the sink

change, but it was better than it is now. The tap is connected to the pipework via flexible pipes, which i guess means that

the diamater inside the flexi-pipe is less

than 15mm and thus reducing pressure further. I have been in touch with the

tap manufacturer and they inform me that the particular type of tap is of the low pressure variety. They

suggest that

i may be able to get hold of a more basic low pressure tap. Has anyone come across this problem before and does anyone know

the solution?