IME the appointment via school with the educational psychologist took ages - and then she didn't mention the word 'dyslexic' in the report.
She did however, staple a leaflet entitled 'How to help your dyslexic child' to the report.
She also advised us to play 'I Spy' with our children more often - yeah, that would solve all our problems!
We went to the Dyslexia Institute for private assessments in the end. It is now called Dyslexia Action (as in my link below).
It was expensive, but worth it.
Ours were carried out by a Professor of Psychology, who was far more knowledgeable about dyslexia than the educational psychologist who came into school.
The tests are very comprehensive, and show a very good picture of where the strenghts and weaknesses lie eg: DS1 has a reading age 3 years above his chronological age, but his writing ability is that of a child three years younger than his chronological age.
They also tell you how severe their difficulties are, which is useful if you want to try for a statement in school.
I don't know of any primary school aged children who have a statement of special needs for dyslexia - in our LEA they won't even do the initial testing until the child is 9.
You might be luckier though.
Also, your son may only need a little extra help at this stage, and then be fine.
I use stiles with my youngest DS, as he finds reading difficult. He's 8, and we've used them for over a year. I think the Bright Minds website sell them (at least they used to) - they also have other items which are helpful for dyslexic children.
Lots of wordy board games are great for practise. DS1 is also dyspraxic, so we use games that require hand/eye co-ordination eg: jenga.
Mind maps are good.
Wordshark and Numbershark are excellent computer software programmes for young children with literacy difficulties. Expensive though, so check out ebay first to try and bag a bargain!
HTH.