I am planning a loft conversion and want to put in a shower.

Currently we have a conventional boiler and a ropy old indirect system
with cold tank in loft, hot water tank supplying the family bathroom.
I have put in a shower pump so that the bathroom shower is very
powerful and as a consequence has a very short lifespan before we are
cold showering.

So...... the loft shower. I need to have a decent flow and an endless
supply, so should I
1. put in a combi in th eloft to supply the loft hot water and heat
2. put in an electric shower
3. re-do the current system and replace with....
4. Put insome kind of thermal store or hiogh pressure system
5. do something else?

as you can see, thinking is at early stages and so any advice would be
looked at kindly

cheers
Ged