It should be enough from the popular summits, even though there is less activity mid week. If you can post an alert it will improve your chances a lot. The information in that old thread is still valid.
Yes it will be but as Stewart says there are people workable if you can run SSB. Now a travel pole, J-pole and handy is trivial to sneak into your luggage.
Remember you need 25kHz (or 12.5kHz) channel spacing and the UK band is 144-146 with FM from 145.00 to 145.800. Calling is on 145.500 and you are expected to QSY from the calling frequency, a fact forgotten by some SOTA people when excited on an activation!
You’re almost guaranteed a couple of contacts from regular chasers in the Lakes. In my experience the remaining contacts tend to come from other walkers, so picking a day/time which is popular with walkers helps (e.g. Good weather, holidays or weekends).
Personal top tip - remote earpiece/mic. The earpiece helps you hear the contact over the wind noise; the mic allows you to hold the radio (and therefore the antenna) above the rock you are trying to shelter behind. Good luck!