Water Tank / Boiler Question

[matt173407]

All

I am looking at upgrading my bathroom, at the moment there is a combi boiler although a small unit and a water tank in the bathroom.

I am looking at removing the water tank and getting a bigger boiler what are the pitfalls of doing this or am i best keeping the water tank and moving it into loft ? apologies if this is a daft question no nails glue is about the extent of my building knowledge!