I'm going to stop you in two places. First, this line:
I want to take a week or more off work, to weightlift everyday, and
increase my lifts as much as I can.
At maximum, and this is if you're on a great program, you'll gain 4%, tops. If you're an intermediate lifter (which I'm guessing your not just yet), you'll gain maybe 3%, tops.
I squat in the morning and in the evening minimum...
Unless you're a very high level Olympic lifter, I don't think there is any training program that would advise a schedule like that. The only reason Olympic lifters can do that is because they're not doing maximum strength effort on technical lifts during multi-sessions-per-day.
Since you said you're in the UK, and want to get strong, I would recommend these steps for you:
Contact the Great Britain Powerlifting Association. Under "organisation" you'll find links to area coaches and gyms. Email them and explain your training history (be 100% honest), your goals, and the time you can allow.
If you get a qualified coach (from the link above, someone who can point to high level athletes they've trained, not some guy at the big box gym with a polo), follow what they tell you. If you decide to pave your own road in the beginning, which plenty of people do, make sure you pick a proven strength training program.
An old coach of mine explained athletics like filling up a bathtub, one teaspoon at a time. Each training and rest day matters, but more so the cumulative nature of doing it for months and years is what separates weekend warriors from amateur and professional athletes.