Of course they do, but they won't necessarily know the names of some of their opposition, particularly as, in this case, many of them are players they probably haven't seen before
For example
The players in red I know of and would recognise on sight
The players in green I know of or have heard the name but probably would not recognise if I met them in the street
The players in blue, I have never heard of. Without their jersey numbers, I couldn't even tell you whether they were forwards or backs.
England:
15-Mike Brown,
14-Marland Yarde
13-Manu Tuilagi,
12-Kyle Eastmond,
11-Jonny May,
10-Freddie Burns,
9-Danny Care;
8-Ben Morgan,
7-Chris Robshaw (captain),
6-James Haskell,
5-Geoff Parling,
4-Joe Launchbury,
3-David Wilson,
2-Rob Webber,
1-Joe Marler
Replacments:
16-Joe Gray,
17-Matt Mullan,
18-Henry Thomas,
19-Dave Attwood,
20-Tom Johnson,
21-Ben Youngs,
22-Danny Cipriani,
23-Chris Pennell