November 2009 update
At least 4 covert cameras one/ two dvr with as big a hard drives as possible.
Second DVR hidden in property, ADSL link with sever for backup, high quality B/W cameras all round 0.00005 lux level, all hard wired. Full continuous frame rate record minimum 25fps per camera. External Pir triggered LED lights. All the cameras should either be pointing within your boundary or in a public space and never in someone elseâ€™s garden unless pre agreed with them in advance (recommended this is done in writing).
Do not buy a 24hr VCR, you will kick yourself when it kicks off and the quality is crap.
I am always available for advice firstname.lastname@example.org. (15 years technical surveillance officer home office quaified)