Unsure how my wages are now being worked out.

sheramber

If you paid the same each month you are being paid on a monthly basis. 

In a 4 week month you will work 36 hours but be paid for 39.

In a 5 week month you will be  work 45 hours but be paid for 39. 

Over the year you will work 52 weeks  of 9 hours =468 hours

You will be paid for 12X 39 hours =468 hours 

Uriziel

If they are putting you on a salary you should be working the same amount of hours every week. Your contract should have automatically rolled over since employees are part of a business. You are nothing more than an asset that is owned by the business and since the new owner bought the business they also bought you and your contract. They cannot put you on a new contract without you agreeing to it. Everything about this is illegal which means nothing unless you are going to sue them. If you want to just work and stay employed I suggest asking them how many hours you are expected to work and what your monthly pay is and go from there. If you don't like it you can look for another job. You can seek out advise from CAB but it's pointless unless you go to court though a letter from CAB might change their behaviour.