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I assume you are based in ....SW19 ?
@Shrews where do you live?peeps here organise jam/recording sessions in studios, see http://thefretboard.co.uk/categories/events for a listlooking for people to play with? I guess here http://thefretboard.co.uk/categories/personnel or maybe a thread in >> Guitar for your region.
@shrews - come along to the Leicester event in 4 weeks time. I’m sure you could pick up one of the songs there. Knocking on heavens door is only four chords.