Jkf wrote:

I have been amazed by and grateful for all the responses
to my note. I'm working on figuring out the best method.

While the devotion shown by many on this group to buses and trains is
touching, you aren't in England every day and probably don't get that much
holiday time per year, so this probably isn't a good time to slum it. In
this circumstance I think you should get a taxi from Heathrow to the exact
address in Blackheath, rather than worry about relying on at least three
trains or buses all being punctual. Make sure you get a proper taxi from the
taxi rank - there are numerous illegal chaps touting "taxis" in the airport,
and these have been known to take very circuitous slow routes, and aren't
insured.