I'm a bit out of touch on bike locks as we've rarely needed one but I'm keen to keep our bikes secure both on the rack and when we're out and about. They'll be mounted on a VW bike rack which does actually lock each bike in place but I reckon we need more. I have an old Abus (fairly decent at the time) D lock and some mid range cable lock which is probably only a mild deterrent. Any decent locks I should look at? They'll be stacked my son's (new, £420), mine (custom built over many years - cost me about £3000, worth much less now as it's dated), my wife's (worth very little - cost £650 in 2008, had about £300 spent on it) and my daughters (probably £250ish in value); any suggestions? Or do we stick with what we've got and take out some kick butt insurance?