EDIT: this reply was for the first part.
The relay board says 70Watts at just 35Volts.
You need a part that is rated for 240Volts AC.
I think the web page is poor given that you have to follow a link to a separate Wiki to find the voltage of the relay contacts.
I am not sure your exact requirements, maybe this one from Hobbytronics. Miniature relay board. They have a few others too.
The description says 250VAC and 10 Amps. It can be driven with a TTL signal (you just have to connect it to a GPIO output - it has the driver transistor built in).
This is not a part I have used myself, but I can recomend Hobbytronics for supplying electonic components in the UK.
Hope this helps save your project from bursting into flames - Paul
Be extra careful with mains projects. If in doubt consult a qualified engineer.