Also the sims are easily available for cash. I just need it for a few days.
But have you seen the rates of Lycamobilehttp://www.lycamobile.co.uk/en/special-rates-with-uk-plan
19p per minute to phone a mobile, 12p / minute landlines. 9p per mb of data and 19p per text.
Threes regular 321 sim is 3p per minute phone (landline or mobiles) 2p a text and 1p per MB
You can walk into any Three store and buy a pre-loaded sim from them for £10. There are Three stores all over the place
Or you can go into any supermarket or similar type store and get the Sim for £1 but you need to add the credit on yourself which you can buy a voucher from the supermarket or just go to the Three website to do it.
You can also use the Three sim as a roaming sim for free in many countries so if you are based abroad you can go home with it and use the rest of the credit at home.
And like I say to even save more money, you can get the data reward sim and also ontip of the above get 200mb free data each month. Just don't tell three when you buy it / get it, that its to be used inside a phone.