I've just remembered that somewhere in one of my Garage drill boxes I nabbed a couple of old Ball-end drill bits from a job like these,
https://www.ebay.co.uk/itm/6X-Nitrog...cAAOSw-29ZWzDi
Well useful for making a dent in awkward broken studs as a ,"Starter" for a drilling
Also Screwfix might have something that can help,
https://www.screwfix.com/c/tools/spe...ies/cat5930008