Thanks a lot for the answers!!
This is how I have always understood it but I was in doubt as I couldn't imagine that also the LARS units coordinate with each other for a VFR flight.
It makes it as already said really clear if 'contact' and 'freecall' are used.
Can I conclude the following;
Biggin instructs 'freecall Farnborough radar': I contact Farnborough with callsign and service requested on first contact and after the 'pass your message' I give them the whole message.
Biggin instructs 'contact Farnborough radar': I contact Farnborough with callsign, inbound XXX, XXXXfeet, service requested on first contact.