It seems to be a little better than a few months ago, but there is also a bit of luck involved.
I'm pretty sure that their orders fly out in bulk, so when an item shows as dispatched to GB, it just means it's been added to the container that will fly out once full - and it seems that this can take up to a fortnight to fill - so you could have one added to it early in the process that will wait a couple of weeks until it's ready to be shipped, or your item could be one of the last, and be in Heathrow within a day.
I had 2 orders placed 15th and 23rd March, shipped from Fasttech on 17th and 24th, both being logged as received at Heathrow within a couple of hours of each other early morning on 7th April. No further updates on them on tracking before they were delivered on the 9th. A few other people also received their FT parcels the same day - FT obviously send large containers of items together.
I've been using
http://www.17track.net for tracking - much less frustrating than the tracking links on FT
Of course the stocking makes a huge difference. I'd split orders to prevent non-stock items delaying those ready immediately (all ordered 23rd March). They were listed as ready on 4th and 9th April. The latter was dispatched on 11th April, the other has had estimated shipping date withdrawn and I've no idea if & when it will be sent.
