Does any one have any recommended contact for an organised tour of the Donana wetlands. English speaking ideally. Scientific ecological bias of more interest than "a trip".

The principal visitors' centre is at El Acebuche, take the A483 south of Almonte and about 12km from El Rocío is the signposted turn at Km29 for Centro de Recepción El Acebuche (959 44 87 11), 1½km from the main road. Alternatively, you can drive 3km north of Matalascañas to the turn-off at Km29. The centre has an exhibition about the park, a café and a shop selling maps and books. From the centre is a signposted 5km trail through scrubland and pine trees. Next to the centre is the El Acebuche lagoon, with bird hides, where you can see purple gallinules, among other birds.
From El Acebuche there are four-hour trips into the park run by the Cooperativa Marsimas del Rocío (959 43 04 32), which must be booked in advance. The four-wheel drive vehicle can seat 21 people and guides speak some English.
There are two trips a day (excluding Mondays), at 0830 and 1500 (1700 in summer). A typical trip will take in all three ecosystems in the park - dunes, matorral and marshland - but the amount of exposure to each environment varies with the seasons. One thing is guaranteed - no two visits will be alike.
See:
http://www.andalucia.com/environment/protect/donana.htm

More ad-hoc trips leave from the centre of El Rocio - you still have to book unless they are very quiet and can fit you in. I'm pretty sure that you have to go through this official organisation to enter the park.