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Hello, please can you tell the model of your Worcester boiler?Also, when was it installed (if you know)?
It's certainly true that adding a second expansion vessel outside the boiler casing is a cheaper option, both in the short and the long term.The word "ruptured" is a bit strong if it was simply the diaphragm that failed. That implies no external leak, in which case he wouldn't need to do any work inside the boiler casing, except to discover that failure.If the vessel had been leaking water externally, he would have needed to uncouple cap off the connection to the vessel, in addition to installing the second expansion vessel..Either way, the engineer should have tested the system, and ensured that there were no faults, before leaving. If he didn't, then I suggest you ask him to come back and do his job properly.