UK - Where can I purchase a B+W 77mm 3.0 Neutral Density Filter?

I cant seem to find any shop/outlet that has one of the above for sale in the UK.
Does anyone here know any different?
It will be really appreciated to be able to find one soon.
Thanks

Does it absolutely have to be found locally? At the very least, maxsaver.net sells them online, although shipping times aren't exactly super quick.

I think those are for all intents and purposes a special-order item. In the US, both Adorama and B&H list it as "back-order"; if they don't have it in stock, the only way I'd think you'll find one is in the long-forgotten dusty back reaches of an out-of-the-way boutique photo shop's storage area, where it fell off the shelf.

According to the on line shops I called in the UK, they have been waiting for them to come in for a few weeks. They are supposed to be in stock at the end of the month.
Thanks for the replies.