CFD brokers and Spread bet brokers are very similar. Actually quite often they are the same firm (think of IG Index (S/B) and IG Markets (CFD) )
Both a CFD and a Spread bet are synthetic products that are derived from an exchange that actually physically delivers something whether that be a foreign exchange of currency or transfer of stock ownership.
When you trade either a CFD or a Spread bet product you are betting on the difference in pips between your open price and closing price multiplied by the size of your bet. Your bet size is determined in either units of currency per point movement (spreadbet) or Lot sizes (CFD) which are multiples of a notional trade amount (eg, 1 lot of EURUSD = €100k notional = $10 per point)
The advantage of a spreadbet is unique to the UK in terms of it being a tax free product for most of the participants. there is a misconception that trading a product as a CFD gives you a spread advantage because you are trading directly on to the exchange or with professional counterparties and that's not correct.
You may find a CFD provider who gives you raw spreads plus comm but you may find a spreadbet provider who offers you something better.
Don't dismiss a spreadbet because you think a CFD is better until you compare the CFD offering with the spreadbet offering. There are plenty of spreadbet products and firms that offer better conditions than some CFD providers (and vice versa)
I got your point thank you for the information