Hi Venco,
As a fellow Dutch guy my advice would be to say no to SH and yes to LH. Unless you're at a very bad place at the moment, only then I would say yes to SH.
To answer your question:
Basic pay year 1: £58.847
Allowances: Just under £20.000 (standing by to be corrected).
Net is hard to say. Depends on your tax situation in the UK/Netherlands.