Answers by paragraph;
1) links are offered to give you fuller help and so respondents can demonstrate that their answers are fact not opinion.
3) It is likely your friend�s terms were protected by TUPE (put it into Google to find what it is), which typically ceases after 3 months, so what the franchise are doing sounds legal to me. But they ought to have offered statutory notice to make the change (which if she's weekly paid they have) and if the terms are significantly different, possibly redundancy as an alternative. With less than 2 years service your friend does not qualify for a redundancy payment, so don�t get excited by this one.
4) Signing a contract is a complete misnomer. If she continues to work for them past the effective date she will have be deemed to have accepted the terms. So no, if she refuses to sign it doesn�t matter. Her only way of �refusing� is to withhold her labour, which is effectively resigning.
5) Under working time regulations she is entitled to 20 mins break because she is working 6 hours or more.