Mel wrote:
Would like to start the base in about a months time, so anything on the
market to clear weed in this time scale.

I annually spray a solution of sodium chlorate in places where I want
NOTHING to grow for the next year . . . and this happens to be only on
our many narrow gravelly paths that wind through the garden. After
about seven days grasses and weeds in the paths are dead. Deep-rooted
weeds are a bit of problem - the only thing to do with them is pull them
up. But, NOTE, sodium chlorate is very toxic, you need to make sure the
spray does not wander onto adjacent plants, particularly in wind.

If you just want to clear the area upon which your shed is going to be,
then, similar to others' suggestions (above), why not just deprive the
growth on that area of light for the next month. I have seen 12'x12'
plastic tarpaulins (or ground sheets) for £4.99. Just weight one of
those down with stones and in a month's time all beneath will be dead.

As for getting to the shed, if that's a problem, walk that route just
twice a day and you'll have a natural path.

I used to spend my life getting rid of every single weed. It's a battle
that is not to be won. Now I just remove the most offensive or the ones
a little too close to other plants. A wildish-looking garden is the
answer!

Ellie.