The "empty calendar in Britain" is a red herring. The Women's 5-Day (whatever it ends up being called) is most certainly NOT a "Tour of Britain", as according to information around, it will be confined to the eastern counties and north of London. I suppose that if a good major sponsor comes in they will get title rights. As the race will be a UCI calendar event, fitting a vacant slot in the calendar is important, because they obviously want the best riders possible, and that means steering clear of race dates in Europe at least. Not so simple because there are quite a few Belgian/Dutch races, added to the few French ones, and the pool of better riders is small, not like men who have the three divisions and large team rosters so it's possible to have two or three programmes running, and races can slot n according to ranking. Even the ToB (2.1) clashes with the end of La Vuelta (GT), which illustrates the differences between calendar planning for men and women. Given the right status a team such as SKY, OPQS, etc, can easily run teams in both to a high standard. There are simply not enough women at that standard (yet), so planning for top events is quite tricky regarding dates.
Phew!! Think I'd better get off on the bike