Hi Orfy :),
The 2 types are Summer fruiting and Autumn fruiting. I have only grown Autumn fruiting before and I know that with these you only cut out the growth that has already produced raspberries, leaving the fresher greener stems for next years fruit to grow from. I do the pruning in the spring so that the dead stems provide a bit of shelter and protection for the fresh growth over winter - also, it is easier to tell the old (brown) from the new (green) by then. The Summer one, I think, you prune it all back in the Autumn, after fruiting, and new growth will appear the following spring.
Not too sure with the Summer one although I was given some last year so will be following this thread myself! :-\ ;)
Good luck with the Lottie anyway! ;D
Donna