If you sign up to TalkTalk over the Bank Holiday weekend on any of their call plans you will get free connection which is worth £29.99
Following information taken from their site:
"Connection fee of £29.99 inc VAT will be payable on your first invoice as normal, 30 days after activation a bill credit of £29.99 inc VAT will be applied to your TalkTalk account. This credit will show on your 2nd or 3rd bill. Available only in through http://www.talktalk.co.uk
and through TalkTalk telephone sales channels."