Alex, dude, what will happen is that you'll go away on the holiday, it'll take you out of your normal routine a bit, so you'll need to think about what you're eating and when and use the normal rules you've hopefully been taught about carb counting and action of insulin and then apply those rules to whatever you're eating.
You've posted before about the stress of diabetes. I can understand that. It is stressful. One of the important things to learn is being able to say, yeah, haven't been in this situation before, but let's see how I'll deal with it and fit my T1 into it too.
A few days in Great Yarmouth isn't that much of a challenge. There's a bigger chance of you being bored to death with a quiet seaside town than anything serious happening on the T1 front - (sorry to any GY residents!). You'll cope with it and then you'll go back home and say to yourself, see, I did that, no problem, what was I worrying about. And then you'll be planning a couple of weeks abroad.
It's understandable you being cautious so early after dx, but you'll get to a stage where you're happy flinging a few pens, strips etc. etc. in a backpack and jumping on a plane for a couple of weeks away somewhere.