I'm fairly new to beekeeping, I got my first nuc from my local assosciation in 2009, in 2011 I split this colony giving me my current 2 colonies, if I split these 2 colonies this year is there a risk of inbreeding? according to beebase there are 25 (registered) apiaries within 10km of my apiary.
Do I need to source "new blood"?
If so When?

Steven