PPP
In EASA land you are looking at £ 8500 start up costs then £ 10k a year in running costs to The CAA. Plus have to write a manual, have quality manager, chief pilot,accountable manager, auditor,maintenance manager.
I have just done so, presented CAA with our manual Feb 1st, might go live if lucky by September. Best thing is to piggy back of someone elses AOC unless you want to be master of your own destiny.
R44 not that good for charter ops due to its performance. For take off you have to have nearly 450m clear space to acclerate over, so counts out lots of places !