Sycamore Syndrome Solved

There are 2 tasks for which we need help. firstly, to cut down the brambles in the wild area outside our garden again and secondly, to get rid of all the sycamore seedlings that are growing throughout our flowerbeds in the community garden (There are 3 sycamore trees in our neighbour's garden which drop their seeds into our beds - hundreds of them!) They can be pulled up very easily without tools but it is a back-breaking task for over 75's. We would be so grateful for your help any evening or weekend.