I ordered a GMT and a 58 from Fraser Hart in Leeds. Put 10% deposits on both (GMT on 14/6, 58 17/6). I was quoted a month for the GMT as I was next on the list and 3-4 months on the 58
I collected my GMT on Monday (it arrived Saturday) and was told they had been chasing the 58. They have said they hope it will arrive in the next 2-4 weeks which would be less than initial estimate.
Lists aren't that big for these if you find the right place.