Hello Winmeek and RobertCasey.
Thanks for your information!
I have checked some of the Project Groups on FTDNA, and found several S27800 kits that aren't on the Big Y. They probably paid FTDNA to be tested directly for S27900 or the R1b-P312 SNP Pack, and they are far less expensive than the BigY.
FTDNA doesn't provide ready access to these alternatives.
It seems very likely that kits with DYS392=14, and DYS464 c,d=16,18 (or maybe 16,17) will be RS27900. Some families, such as Meek, Williams, Powell and Webb have 15-20 kits likely to test positive for S27900.
Those kits (like mine) that tested for RS27900 prior to BigY don't show up on the BigY matching name list. And since my BigY haplotype has now been "updated" by FTDNA to FGC39849 - a sub-clade of RS27900, it will probably mislead others looking for matches to S27900.
As I mentioned before, there seems to be a difference between the precision of the old BigY testing process and the new one.. The new one doesn't seem to go as far, or maybe the interpretation is different.
I am in contact with FTDNA and hope to get an informative answer to some of these issues.
The ancestral names are no longer exclusive Welsh, and there are now several DYS390 with the "English" 24 as opposed to the "Welsh" 23
Llanfi