Old Soil, New Lawn

Hi all
I have joined this as my boy friend and I have a problem. The garden of our new house had not been touched in aprox 5 years, so we have set about it with back breaking work and are down to the soil now, but previously had brambles, nettles and grass shoulder deep in parts. Now looking at a way to get a new lawn down 9/10 weed killers need the weeds to work on the roots, but we don't want weeds, esp brambles, sprouting through our lawn.
In a nutshell we need a root only weed killer that will keep the soil fertile PLEASE HELP!!
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JMacA

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Never heard of such a herbicide and can't imagine how it could work. If it were me, I'd simply let any new growth from weeds emerge for a couple weeks, then apply glyphosate. Since you seem to be from the UK, you don't want to be trying to establish a new lawn until Sept anyway. That leaves plenty of time to kill weeds the usual way.
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