That's good Ghdp,
If you can get the vines up on some light netting so they are off the ground it pays dividends, as the cold ground slows then down a lot . They will need lots of sun as well , I've often had to snip the odd leaf off to give them it .
They'll also benefit from a quality liquid feed.
If the frosts hold off , by the middle of next month you'll like as not have plenty rock solid ones that will store in a cool out of strong light place for several months . we ate out last one from the 2014 crop[ at the end of march 2015
They make a brill chicken stock based soup .