You look like you have an excellent set up - crew on the foredeck enjoying the view, two empty drinks glasses under the starboard sprayhood and another sneaky one on the cockpit table presumably drained by the helmsman.
Anywhere with high hills and valleys for the wind to funnel through (lake district or many bits of west coast of Scotland) can cause pretty high gusts, although usually temporary and once you build up local knowledge you can come to anticipate them. Or at least look at boats ahead and see if they are over on their ear!
If you ease the mainsheet in plenty of time its not a problem, once the crew get confident that the boat leans in the wind, but is no danger whatsoever - its only a seastate that's an issue and you are not gong to get much of that in the lakes.
Its worth mentioning that these boats sail ok on most points of sail under genoa alone so if the wind really gets up you can drop the main entirely. The boat will still heel though - it has relatively high topsides so will heel in high gusts even with no sails up.
Happy sailing.