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@BrickMan
no to locktight on crank bolts.
if you have to tighten it so much that you are damaging stuff then I'd say your tapers are fubared.
clean both surfaces very well, you want the lightest smear (almost a streak) of something greasy on the tapers, then refit bolt and tighten up (bolt + threads should be cleaned out too), f you don't have a torque wrench (you should have one of these really) to get to mftrs specs then bend over the bike, wrench at 3oclock, crank at 90clock, and slowly put your weight via your shoulders onto it, there will be a point where the amount of force req'd will suddenly increase, thats where you want to stop to avoid stretching things.
do not put thread locker on crank bolts. a few months of british weather (and teh correct torque) will ensure that bolt stays there.