Can all the answers to the driving theory test be found in the highway code?

No

The rules of the road are in the Highway code, but the Theory Test is broader than that. The Highway code gives you an understanding, and with a bit of common sense you could pass the test. But there are many questions broader than that of the Highway Code itself.

Want some free theory help, check out the downloads on my site below.

Buy the DSA dvd cd rom thing. All one thousand questions will be on it. Yes all 1000 of them.But not all of them will apply to a lerner driver. The questions on your theory test will be geared up to your standard. IE a new driver I took mine as a driving instructor its the same 1000 questions they just pick the questions to suite the person taking the test.

yes all the clues are there, plus other dsa books, the essential skills etc, you can try the test on the dsa website, the questions are easy especially when you know the answers