I go back about 5-6 years with Andy and he always had primo NOS tubes delivered in a timely manner (about 1-2 weeks). There were certain times of the year he was out on tube shopping trips so the store was closed. Then there would be a backup on deliveries (3 weeks).
The worldwide tube crisis a couple of years ago did him in. He was still operating as a one-man-shop and wait times turned into months. He was also forgetting to fill orders. It happened to me and 6 months later he called and asked if I still wanted the tubes, I had moved on.
I believe some current orders are taking 3-4 months, so Brent has been getting all my business.
EDIT; Please do try his new online order feature. They're the same quality tubes noise-rated by colour. I received mine in 3 days time.