They're going to ruin motorcycling.
The New Staged Access Routes to Motorcycle Licence's
**A1 (Standard) **
This can be taken on a machine between 115 and 125cc. If you are aged between 17 and 19 this will be your only option.
Upon passing the A1 you will get a full licence to ride on motorways and take pillion passengers, but you will never be able to ride anything bigger than a 125cc machine that produces a maximum of 11 Kwh (14.6 Bhp) until you pass the next test (A2) when you reach a minimum age of 19 or two years after passing your A1 test.
The test and training must be taken on a machine of a minimum of 395cc that produces a maximum of 35 Kwh (46.6 Bhp). This can only be taken when you are at least 19 years old or two years after passing your A1.
Upon passing you can ride any size of motorbike but the power is capped at 35 Kwh (46.6 Bhp) this will never increase!. The other "restriction" on this category, is the machine cannot be restricted to 35 Kwh if it produces more than 70 Kwh or 93.5 Bhp in standard trim.
The Direct Access Scheme will still be available but the minimum age will rise from 21 to 24. The bike engine size of at least 595cc and must produce at least 40 Kwh (54 Bhp). You must be at least 24 years old or can be taken two years after passing your A2.
It is possible to obtain your A Licence at 21, ONLY IF you have already passed your A2 licence at 19.
Automatic Scooters and Motorcycles
If you take your training and test on an automatic machine, all of the categories of licence and size of bike are still relevant.
Comes into force on 19th of Jan 2013.
My advice is that if you want to get into motorcycling get a full licence done now before this crap comes in.
Oh and I'd go for the Honda CBF 125. If you're quote tall though you might be better with a taller 125 like a road biased trials or a supermoto style, e.g. the Suzuki DR125SM. I had the 400cc version of this and it was stunning. Part of me regrets ever trading up.
If you want ubercool then KTM do a Duke 125. It is however very expensive compared to the above.
If you want the best there is and plan on staying on a 125cc then the Honda XL125V Varadero but it's very expensive any only worth buying new if you're tall and don't plan on getting rid - this is essentially a big bike that people go touring on, it just happens to have a 125 engine.