[Updated] Britain will have four drivers on the F1 grid next season after Max Chilton was confirmed in the second Marussia seat for 2013. The 21-year-old from Reigate impressed with two wins in GP2 this year, ultimately finishing fourth in the standings, with Marussia’s junior team and his promotion to a race seat at the senior F1 outfit seemed inevitable after he was announced as its reserve driver from the Japanese GP and made his race weekend debut in first practice in Abu Dhabi. Chilton, who is likely to bring a budget with him given his father is the vice-chairman More…