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Donate or recycle your old monitor
Never, ever send your old monitor to the tip. CRTs contain up to 3kg of lead plus other toxic materials that could leach into the soil and water in minute quantities if not properly disposed of. At this point, most LCDs contain lead and nearly all contain mercury.
As long as your old monitor is still working, it could be a boon to someone else. Check local listings for charities that accept computer equipment. If you'd like to help a lucky individual, join your local Freecycle group. If you're sure your old monitor is no good to anybody any more, check with the vendor or your local government to find recyclers in your area that can handle monitors.