I am currently going through the very early stages of a split with my
wife of 12 years.
We have 2 children (ages 6 & 8) which my wife is currently not
allowing me access to.
She claims they are traumatised by our arguments and are now scared to
see me!
See says that I have no claims on the property until the children are
16.

Can someone advise if the above is true, we have a property valued at
approx. £300,000
with only a £50,000 mortgage outstanding. Additionally, we have a flat
which is currently rented out which is worth approx £100,000 (no
mortgage)

My wife and I both work full-time and we both are paid approx the same
salary (£35,000 each).

She has indicated that she wishes us to go through a mediation process
to sort out a) any access to my children and b) the finances.

I am currently lodging at a friends house and was wondering if anyone
can advise what , very roughly, I might expect out of this. I realise
Solicitors are an obvious option, but would appreciate any advice
anyone could give me regarding this.

Kind Regards..