ipsec and nat

Hi everyone! 
 
I have a little problem that I would need some help with.
 
I wan´t to be able to setup the following.
 
At the office in London we wan´t to install a super freeswan VPN
gateway. 
 
Users at the office in Stockholm wan´t access to London via the VPN
gateway.
 
In Stockholm we don’t have a VPN gateway, and we don´t wan´t one. 
We have a natted network with 3 client computers. And those 3 are
running Windows XP and are going to have certificates installed issued
by the London VPN gateway.
 
We wan´t to be able to have all three clients simultaneously connected
to London. 
And this is the part im not sure how to setup. 
 
So do anybody know how to connect these computers?
 
Help is appreciated.
 
Regards,
Daniel

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