it's looking good, but I don't know how hot its been where you are, it could just be the heat, I would keep applying to anything that looks green and alive as long as the weather stays dry
Glyphosate will kill the plant right down to the roots if used properly and allowed to work. It is absorbed by the leaves then taken down to the roots which is why someone said if you spray the foliage your side it will kill the plant their side. Just keep redoing it until the plant dies, best on a hot day as the plant will take it up more readily than on and overcast cool day. Afterward you will have to cut all the dead material back but don't do this until it's dead or you're wasting your time. You don't cut it back then spray as the new growth takes up the poison better than tougher growth.
No problem we had a similar problem where we used to live with ground elder coming in from our elderly neighbour's garden, be thankful you've just got Virginia Creeper!
Just be careful if there's a breeze though as it can get blown onto plants you want to keep. If it is windy put a bag over the bit you want to spray and spray inside. The plastic should speed up the take up process as well.
Plants that size often need repeat applications and a bit of vigilance after that as well. Two pronged attack from you and the neighbour will help the process Ice Twin
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I was digging it out under our side of the fence because I was pregnant at the time and didn't want to spray. We had loose soil so I was getting on top of it, would have been a different story on clay. I gave the old fella next door a watering can and a bottle of the stuff. I reckon he used it once then started pulling it up. It browned the leaves slightly but he should have left it and repeated the treatment. He was reluctant to use it in the first place because he said it would contaminate the soil despite my claims otherwise. So I think if he'd continued using it yes it would have worked. It was everywhere, the soil was compacted and he was in his 80s so it was really the only option.
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it's looking good, but I don't know how hot its been where you are, it could just be the heat, I would keep applying to anything that looks green and alive as long as the weather stays dry
Oww it's been about 26o, I hadn't considered that it might be the heat. How regularly would you advise me to reapply?
Also after i've got ontop of the problem will the plant try to regrow, or will it actually stay dead?
Glyphosate will kill the plant right down to the roots if used properly and allowed to work. It is absorbed by the leaves then taken down to the roots which is why someone said if you spray the foliage your side it will kill the plant their side. Just keep redoing it until the plant dies, best on a hot day as the plant will take it up more readily than on and overcast cool day. Afterward you will have to cut all the dead material back but don't do this until it's dead or you're wasting your time. You don't cut it back then spray as the new growth takes up the poison better than tougher growth.
Thank you Mrs G that's very helpful
I'll keep attacking what's on my side with glyphosate, and advise the neighbour to do the same 
No problem we had a similar problem where we used to live with ground elder coming in from our elderly neighbour's garden, be thankful you've just got Virginia Creeper!
Just be careful if there's a breeze though as it can get blown onto plants you want to keep. If it is windy put a bag over the bit you want to spray and spray inside. The plastic should speed up the take up process as well.
Plants that size often need repeat applications and a bit of vigilance after that as well. Two pronged attack from you and the neighbour will help the process Ice Twin
I live in west central Scotland - not where that photo is...
For Mrs G Did the glyphosate work on the ground elder too?
I was digging it out under our side of the fence because I was pregnant at the time and didn't want to spray. We had loose soil so I was getting on top of it, would have been a different story on clay. I gave the old fella next door a watering can and a bottle of the stuff. I reckon he used it once then started pulling it up. It browned the leaves slightly but he should have left it and repeated the treatment. He was reluctant to use it in the first place because he said it would contaminate the soil despite my claims otherwise. So I think if he'd continued using it yes it would have worked. It was everywhere, the soil was compacted and he was in his 80s so it was really the only option.
Repeat applications, got it
I'm taking great pleasure in watching leaves turning brown... I think I need a hobby 
Well I think it seems to be working
Before
And now