Just an FYI, and this may have been discussed already or be a statement of the bleedin' obvious, but RM post times are now running to weeks.
I sent some DB strings (1st class) to a BCer on Monday and they haven't arrived after 5 days. Likewise, I ordered some flatwound strings from BassDirect on Monday and they haven't arrived either.
When I contacted Mark at BassDirect this morning to check the strings had been posted, he replied
"Hi - the post office is a mess, there are literally dozens of artic lorries full of post to be sorted at most sorting stations, 25% of Royal Mail workers are off at the moment. Shipping is taking up to 3 weeks (and longer) with Royal Mail."
So bear that in mind when buying or selling stuff using RM. Or, you know, sending letters and such like!
(PS, not blaming RM staff who are doing the best job they can, just presenting the facts)