QDM,
GA is most definitely affected.
Original timings would have been (simplistically) IFR-ops require mode S by 2003,
all other aircraft (incl. balloons/gliders/airships) by 2005.
CAA went for extension. IFR-ops by 2005, all others by 2008.
But, and this is worth remembering,
AFAIK the other countries adopting Mode S have not yet agreed a deferral
There are currently
ZERO Enhanced Mode S boxes available for GA.
Likely outcome from that is IFR-ops will have to seek exemption until the kit is available, on the basis that
as soon as kit available, it will be fitted (including proving fitting "appointments" and proof-of-"purchase")
Estimated cost for an enhanced Mode S box: unknown - captive market, high R&D = give them a blank cheque
Quite important, really...
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There are currently three very significant things happening in UK that will have an affect on our
hobby.
AIS changes
Rule 5
Mode S
Maybe I need to talk Mike into making our website permanent