Just for info, that P60 will be out of date. It's a record for the tax period April 2011- April 2012
The next P60 will be a record of the tax period April 2012 - April 2013 (last 12 months) and should be issued before May 31st 2013. Better to have 6 months payslips with the associated bank statements
There's no need to send an original Land Registry. It's sufficient to send the online print out that can be had for a very small fee.
As a visitor you'll need to provide good evidence of compelling reasons to return home before the visa expiry.
A quick search here will reveal many helpful hints and tips