Firstly I have never heard of the variety, did a Google and they don't know either!
I think it might be a sale pitch by Morrisons based on the following;
Beltane is a summer festival celebrated around the world. May 1 marks the Celtic festival of Beltane, also referred to as May Day, which many neopagans and Wiccans around the world observe to celebrate the onset of summer.
Personally,and because you mention growing in pots I would pot them up one per 5"/6" pot and grow them on! You never know if they are going to fruit, who knows they might be a late variety and have yet to set flowers.
Regarding the runners you could direct the runners into 3" pots and root new stock for next year.
Who knows your with your 3 plants you might end up with a dozen more for next year and onwards.
Basically I see it as" nothing ventured- nothing gained.
http://www.thegardenersalmanac.co.uk/Content/S/Strawberry/Strawberry.htm