TF, I don’t know if anybody knows for certain for your circumstances, but your best plan might be to get current again soon, so that your BGA licence can be converted to an EASA licence by what would then be “grandfather rights” without further tests and examinations, before April 2015. Don’t leave it to the last minute.
I appreciate that but, for various reasons, that may not be possible.
My current plan was to get back into gliding in about five years time. I don't fully understand the proposed conversion process but there seemed to be requirements for log book evidence to be signed by a club CFI etc.
Not relevant to me but what would happen in the case of somebody who was current but flew independently of a BGA club? I know the BGA like to think they have a monopoly and total control but actually they don't!