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The Web API provides a way to access ECMWF's data archives in batch. See A brief guide to the Web API for more information, including how to set up the service. Metview versions from 4.4.3 onwards have support for this service.
Setup
First, ensure that you have access to this service by following the steps in the page linked to above. Ensure that you have set up your ~/.ecmwfapirc key and that you are registered for the datasets you wish to access. If you can retrieve some data using a sample script provided there, then you are 90% of the way to accessing the service from within Metview.
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