Has anyone been on the 3 Bridges Blast boat trip from Edinburgh Marine Academy. We've just booked it for a family trip and I'm not nervous as it looks like there's a lot of holding on! They've reassured us it's suitable but I'm a worrier so was wondering if anyone had been on it and could let me know about it. For example now fast it goes! Our group ranges from a 7 year old to a 73 year old!