The message
from Sacha contains these words:

We're just getting round to putting in tulip bulbs now. BTW, has anyone
else heard/read/known that burying them about 8" deep makes them display
better year after year?

Yes, but having tried it, I don't believe it :-) Whatever I do, my
tulips never last more than a few years in wet acid soils. Might be
different in drier areas, or limey soils perhaps.

Janet.