Help! What to do with bare rooted currants?

As a pressie my Mum has ordered me a load of offers from the Gardener's World Magazine this year and a black currant and red currant have just arrived in the post this afternoon 

Only trouble is...I'm not sure what to do with them. I realise I need to get them planted asap...but the question is where

The plot isn't ready for planting at all as it's completely waterlogged and mostly frozen still. Do you think they'd be OK in a spare bit of ground in my garden until I can finish the bed they'll be in at the allotment? Or would it be better to put them in pots/growing sacks to minimise the root disruption when the bed is finished at the allotment?

I've not grown currants before so any tips/experience would be very welcome 

What a lovely mum you have 

Fruit benefits from a bit of soil preparation, so dig over your fruit patch well and dig in lots of composted farmyard manure or home made compost if you have it.  If you buy bags of manure from the garden centre, get a couple extra and use them as a mulch over the soil surface after you have planted the fruit.  It pays dividends to give them an annual mulch each winter thereafter.