I bought an updated English Channel card last summer from www.yachtbits.com - from memory they said the new issues come out in March / April.
Best to give them a call on 01502 569079 as they had some sensible advice on how to upgrade and keep the cost down ( only a bit as it's still horrendous ). Delivery was within 7 days - including sending my old card to them ( just remember to send it recorded delivery as it has a value of £40 or so ).