Thank you, THE_FERN and yes, you're quite correct. After I posted (!), I logged into eBird just in case, and found exactly what I was looking for..!
For anyone's interest, I started logging each new bird this time last year. The total is just under 130 now, one or two suspect (probably false) records, I know .... It got a species boost by a trip to BC and Alaska. Some of my different lifers are I think the same animal, just under different names for UK and North America! Eg Pacific Wren and Eurasian Wren look indistinguishable to me.?