On 2014-06-01 09:27:20 +0000, T Blake said:

We want to make a Cloche with hoops of bent-over plastic water pipe,
covered in Plastic sheeting; to end up like a minature Polytunnel for
the allotment.

We dont know where to get a large sheet of plastic from here in North
West London, so we are going to stick together 'cut-open' clear plastic
bags.

What would be the simplest way to stick the bags together, and if glue
is the answer; what is the best type of glue to use please? Bearing in
mind we would probably have to use lots of it and it would have to be
one hundred percent waterproof. Thanks.

Try looking here and on eBay. http://www.gumtree.com/for-sale/uk/polytunnel

Plastic bags won't last 5 minutes.
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Sacha
www.hillhousenursery.com
South Devon
www.helpforheroes.org.uk