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tokens: ACKNOWLEDGEMENTS PH acknowledges receipt of a Science and Technologies Facilities Council (STFC) studentship. HVA acknowledges the Spanish Plan Nacional de Astronomía y Astrofisća under grant AYA2016-76682-C3-2-P. The European VLBI Network is a joint facility of independent European, African, Asian, and North American radio astronomy institutes. Scientific results from data presented in this publication are derived from the following EVN project codes: EJ016A and EJ016B. e-MERLIN is a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC. We also thank James Nightingale for a helpful discussion on model optimization and the anonymous referee for helpful comments.