Posted: 20/03/2014 at 17:15
Not a quick fix Lorna but at least it's not a big area. If you can cut everything back with a strimmer or shears, cut through the fabric right round the edge with a big knife, then divide it into smaller square sections, you might be able to dig out most of it a piece at a time. Brambles often have quite shallow roots. New growth that comes through could be treated with weedkiller. It will need going over a few times though. I had a similar problem at a previous house where the pond liner had been taken several feet up the bordering bank and planted up. Large areas of chicken wire had been put down too, to hold the mossy grass in place at the edge and it was all tangled up with weeds, brambles and horsetail. That was the only feasible way to tackle it as we couldn't use weedkiller because of the proximity to the pond.
If you do a little bit at a time, it will seem less daunting, and you could cover up the bits 'in waiting' with heavy black plastic once you've cut the weeds back just to help prevent too much new growth. Old compost bags weighted down will do the job.
Pity you hadn't put the shed on that bit - would have sorted half the problem right away!