Hello, my name is***** am a qualified lawyer and it is my pleasure to assist you with your question today.
Have they given you any option to 'opt' out' of the extended working week at all?
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Many thanks for your patience. It appears that your contract states you are expected to work 37 hours per week as the business requires. I could not see anything that says it would be an average of 37 hours per week or provide a reference period over which this average would be measured. So to try and claim that they can ask you to work whatever hours they want a week, as long as it averages out at 37, when no mention is made of averages in the contract, is going to be somewhat unreasonable.
So you can potentially refuse this working pattern but if the workforce have as a majority decided to accept this change and most have gone on to work under these terms, it could be deemed a reasonable change for the workforce. Therefore, if you refuse to work this new pattern the employer could consider disciplinary action for your failure to adhere to this. Whether they can go as far as dismissal is questionable as you have a 15 year service with them but they could issue a warning for your failure to follow this if it is widely accepted in the company.