I commute into the London on SouthWest Train's and buy a variable length
season ticket (usually about 10 weeks) which includes zones 1 - 6 travel.
Does anyone know when/if I will be able to be issued with an oystercard for
the part of my journey in Central London.

Also why arn't the national rail companies starting to take up this
technologie, as it seems to be a good way to reduce ticketless travel
without increasing delays to travellers whilst checking their tickets.

Thanks

Jaime