After a lot of hard work, applications, rejections, disheartening weeks etc, I got a verbal job offer for the job I really wanted yesterday (and am estatic), its been followed up by email confirming my acceptance. I've been told the formal offer pack should arrive within the week. I had an interview lined up for next week. I read here not to hand in notice until you have the contract but would it be risky to withdrawal from this interview if I haven't got the formal offer pack from the firm job offer yet. Possibly overthinking as its been a slog but I don't want to waste their time or go through more interview stress unnecessarily.