Hi vs,
Well firstly, there is no 'set' amount on the cost of living in London or anywhere else. There are simply too many variables to consider.
Secondly, overall, the average salary across all industries is just over £23,000/year - trying to break it down into male/female catagories doesn't really fit in with the research levels you're mentioning in this post, so for you to try and 'estimate' a budget at this stage is incorrect. I'd suggest a different route in your research process.
1. Evaluate your OWN career/job/income potential - Check various sources into how much your industry pays in the UK, then compare it to your level of expertise and be realistic. Maybe 'potentially' guess your earnings somehwere in between the lowest and highest advertised jobs posted. This will give you an approximation on how much income you can realistically get here in the UK
2. Evaluate your OWN lifestyle standards/requirements - Write down what you 'must' have for daily living and then research into the costs of those. Then check your secondary 'discretionary' expenses (car, gym membership, satellite telly, mobile phones etc etc) that you do want to have. Then finally, check you long term financial standings. How much would you like to save? how much to invest? etc etc
3. Compare your possible income with the outgoings you'd like. Adjust accordingly what you can 'do without' if your expenses are more than your income. Re evaluate.
4. Only then can you 'see' if the financial element of moving over makes sense for you.
5. If you do get a job offer and an 'actual' amount you'll be paid, re assess the income (known) Vs the expenses list again.
6. Create a budget at that point in order to effectively manage you income Vs Expenses in order to achieve your goals.
As for working out Tax and NIC deductions from your paycheque have a look here
http://www.hmrc.gov.uk/employers/more-iwtworkingout.shtml if not, do a search for tax ad NIC calculators online.
have a little look around on similar posts here on this website as others have posted their yearly salary and a breakdown of expenses to get an idea of others who are or have been in a similar scenario.
Hope this helps !
Cheers ! Dennis! West London & Slough UK!