Posted: 26/05/2014 at 21:14
The roses are leggy because they are reaching for light. They sound like shrub or rambler roses, both will lose lower leaves if light isn't allowed to get to the stems. It's the lilac that's the problem. If you can move the lilac and then prune the roses by a third and feed them.
As for the brambles, cut them down to ground level and as the new growth appears spray with a strong glysophate solution. If you can dig some of them out all the better the roots don't go too deeply. Keep a watch out for any new growth if you dig them out and spray as it appears