Are they hiring you as UK Managing Director or what? if not then don't join!!
6 figure base at very senior level!! Wow!! Don't you think every other consulting you named pay 6 figure base to their most senior managers so clearly you are working at or below manager level in those consulting companies.
Having worked with 6 leading consulting companies and assuming if you stayed an average of 2 years with each of them tells us you have minimum of 12 years experience.
damn it in 12 years you could only make to manager level despite of changing 6 companies!! So you are just an average consultant...
Now on infosys...I was offered the same base few months back and after 3 rounds I dumped them due to they asking me to come to europe for final round but not paying for my travel expenses.
Why do you want to work for those cash poor companies who will fight to their death and will try to save every possible penny out of your business expenses after you join them!!
Why do you want to have the likes of Infosys, Wipro, TCS, Cognizant etc. on your CV after working for those BIG Names!!
I just laughed when you mentioned their terms are much better than above!! Have you ever worked during weekends when working for the other 6 companies? Welcome to work like imbalance should you decide to join them!!
Bonus!!!!!!! If you manage to live in reasonably acceptable hotels and travel in reasonable class when on business assignments than that's your bonus!!