Had a quick look but couldn't see this posted anywhere, on the Betfair front page at the moment:

Terms and Conditions:
1.This promotion is only applicable to players residing in the following countries: UK, Canada, Ireland, Spain, Germany, Greece, Russia, Finland, Sweden, Norway, Denmark, Bulgaria, Cyprus, Switzerland, Austria, Czech Republic or Poland.

2.This promotion is only open to customers who have never played on any Betfair Poker product for real money.

3.This promotion is limited to one account per customer.

4.This promotion will take place from 00:00:01 (UK time) on Friday, 11th February to 23:59:59 (UK time) on Tuesday, 22nd February. ("Promotional Period").

5.To be eligible for this promotion, you must:

a) Opt in to the promotion.

b) Open a Poker account by downloading the Poker software or by registering on the Instant Play Poker client.

c) EITHER play at least one real hand of Poker on any cash game during the Promotional Period OR buy-in to any Poker tournament of your choice (with the exception of bankroll booster and freeroll tournaments)

6.The poker tournament must take place during the Promotional Period and you must not unregister before it starts.

7.The free £5 Champions League bet will be applied to accounts within 5 days of the qualifying criteria being met.

8.This offer is not valid in conjunction with any other offer and any wagering using the free bet will not count towards the requirements of any other offer.

9.Betfair reserves the right to exclude users.

10.Betfair reserves the right to withdraw or amend this promotion at any time and without prior notice.

11.Multiple accounts seen abusing this condition will not be credited at all.

12.Standard Promotional Terms and Conditions apply.