Lmedel,
answer these questions:
1. Your IR, is it (a) a FW IR. Or is it a military IR?
2. Do you have an ATPL(H)IR?
IF you have an ATPL(H)IR you can fly IFR and VFR.
If you do not have an ATPL(H)IR, but only an ATPL(H), you cannot fly in certain airspace IMC.
IF you have a military IR, you cannot use it in civilian operations. So you cannot fly IFR (civil airspace, IMC using your ATPL).
If you have a FW IR you can fly IFR or VFR in your helicopter.
All of the above requires you to be TYPE rated.
What should I do if, later on, I decide to become full ATPL(H)-IFR
.
You need to do an IR course on helicopters, which is about £30-40,000.