I can't really see how a general answer here will help much. You're going to have to ask your local chippies what they use, as each shop will have its own policy.
For example, if you look at the website of a specialist wholesaler to the trade you'll see that their range of liquid oils does include rapeseed oil but there's also groundnut oil and other specialist products available:
http://friarspride.com/shop/liquid-oil.html
Many chippies though prefer to use block oils and, once again, there are a wide range of products for them to choose from:
http://friarspride.com/shop/block-vegetable-oil/block-vegetable-oil.html
and
http://friarspride.com/shop/block-vegetable-oil/specialty-long-life.html
So the only possible answer to your question would seem to be the (rather unhelpful) statement that "Some do and some don't"
Sorry!