I found these dates on another forum:

LEXUS 2008 Calendar.
Venue Individual Dates Team Dates
Llyn Llandegfedd Sun 13th April
Hanningfield Tues 15th April
Lough Lene, Co. Westmeath, Ireland 18/19 April
Rutland Water Sun 20th April
Rutland Water Mon 21st April
Carsington Tues 22nd April
Bewl Water Sun 27th April
Bewl Water Mon 28th April
Chew Valley Fri 2nd May
Chew Valley
Stocks Weds 14th May (Floating Line Only)
Stocks Thurs 15th May
Stocks Fri 16th May
Stocks Sat 17th May
Woodford – N. Ireland Fri 6th June (Evening Session)
Woodford – N. Ireland Sat 7th June
Grafham Sun 15th June
Grafham Mon 16th June
Chew Valley Thurs 26th June
Chew Valley Fri 27th June

Chew Valley Sat 28th June (Floating Line Only)
Menteith Weds 9th July
Menteith Thurs 10th July
Menteith Fri 11th July
Kielder Water Sun 13th July
Eyebrook Fri 18th July
Eyebrook Sat 19th (Floating Line Only) July
Pitsford Sun 20th July
Llyn Brenig Fri 25th July
Llyn Brenig Sat 26th July
Chew Valley English National Team Finals – Chew Fri 1st Aug
Chew Valley English National Team Finals – Chew Sun 3rd Aug
Chew Valley English National Team Finals – Chew Tues 5th Aug
Draycote Fri 8th August
Draycote Sat 9th August (Floating Line Only )
Rutland Water 9th & 10th September ***TEAM GRAND FINAL***
Chew Valley 21st September ***INDIVIDUAL GRAND FINAL***

Are now on John's website.