The offending screw...... get the new one so you know exact diameter, and you should be able to drill it out in stages as big a diameter as possble, heat it, and then use an extractor.
I do have a set of extractors and could be coming up to Crawley on Saturday if you can wait till then.
Might come up in the Zed, but a bit nervous in case you have a spanner in your hand
I do have a set of extractors and could be coming up to Crawley on Saturday if you can wait till then.
Might come up in the Zed, but a bit nervous in case you have a spanner in your hand

also with a fair wind I’ll be able to put the rear end in on Sunday so that would be the ideal day as I’ll be doing brake line Saturday.
also the pic doesn’t show the current status of the issue, a well rounded hole with no bite potential for even the largest of the counter screws