[emmetmcl]

The sooner the better in my opinion.

However, as others have said, and something I never even thought of; the election.
Surely that pretty much rules that week out, and possibly even the beginning of the following week, as David or Ed will have to go cap in hand to Nicola Sturgeon :P

Anyway, "early-May" to me is the first half of the month; so I could see it being Thursday 14th May, as they'll probably do another split-launch