This month I was very honored to be invited to two seminar talks in the UK. The first one being in the University of Southampton, where I gave a talk as part of their Gravity Seminar series. My talk was based on my recent publication, Second release of the CoRe database of binary neutron star merger waveforms from one of my previous posts. I mainly focused on waveform accuracy in numerical relativity (NR) simulations and reviewed techniques to ensure that our NR waveforms are actually accurate enough for parameter estimation or waveform modelling purposes.