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OK reverting to this century, yes you understood perfectly!
You say you were exercising the stop cock is it on at the moment does it leak? if not simply cut the pipe above and fit another above it I doubt there will be too much reduction in flow, you have two other options if so either fit a full bore valve (although I am not sure it conforms to water regs, still I guess technically you still have a stopcock with a loose jumper fitted) or bush up to a 22mm valve and then down again.
I have fitted second stop cocks in two houses before and they have been fine for flow rate.
I would try it with a normal 15mm compression valve (compression because you may have old 1/2" pipe not 15mm and solder fittings don't fit both sizes, they are not as forgiving as compression ones) then you can change it later if you have trouble, but I suspect it will be OK.
You say you were exercising the stop cock is it on at the moment does it leak? if not simply cut the pipe above and fit another above it I doubt there will be too much reduction in flow, you have two other options if so either fit a full bore valve (although I am not sure it conforms to water regs, still I guess technically you still have a stopcock with a loose jumper fitted) or bush up to a 22mm valve and then down again.
I have fitted second stop cocks in two houses before and they have been fine for flow rate.
I would try it with a normal 15mm compression valve (compression because you may have old 1/2" pipe not 15mm and solder fittings don't fit both sizes, they are not as forgiving as compression ones) then you can change it later if you have trouble, but I suspect it will be OK.