Bit of an unusual request:

At home connected to a karoke style VCD player, I have a sennheiser e818 (which is great) and I need to purchase a second microphone. There's 2 that I've seen but I'm not sure which and why?

Firstly Sennheiser E825S (great name, and I know that mine's great and this being a newer model must be better) or:
Professional Vocal Microphone (go by the description?)

Maplin > Dynamic Microphone e825
Maplin > Professional Vocal Microphone

Both will set me back approx £20....