This crossword No. 566 clues and answers were published on Sun 23 Jul 2006 and the puzzle can be visited by following The Guardian Speedy Crossword No. 566 link.
All Across Clues and Answers:
1-across – Protozoan life form : AMOEBA
4-across – Art of growing miniature trees : BONSAI
9-across – Block : EMBARGO
10-across – Former European currency : FRANC
11-across – English town with a declining automotive industry : LUTON
12-across – Organ membrane : EARDRUM
13-across – In agreement : BEATONEWITH
18-across – Looks forward to : EXPECTS
20-across – Checks : REINS
22-across – Incongruity : IRONY
23-across – Fancier : AMATEUR
24-across – Extremely unconventional : WAYOUT
25-across – Guard : SENTRY
All Down Clues and Answers:
1-down – Ancient : AGEOLD
2-down – Area of influence : ORBIT
3-down – Lowest British hereditary title : BARONET
5-down – Present : OFFER
6-down – North Sea haar, for instance : SEAFRET
7-down – Coin me! : INCOME
8-down – Snap : LOSEONESRAG
14-down – Agreeable sound : EUPHONY
15-down – Conflict : WARFARE
16-down – Write a critique of : REVIEW
17-down – Marine bird of prey : OSPREY
19-down – S American rodent inadvertently introduced into Europe : COYPU
21-down – Apathetic : INERT
This crossword has in total 26 where 13 are across and 13 are down.