I know it's a couple of hours drive but I am a freelance instructor in the North West and I do a lot of my work at a centre in Pwllheli in Wales.
Please find below a link to their website with a calendar with all the dates, but just quickly looking through there is a coures available 26th - 27th July.
Alternatively if you get in touch I am almost certain that a course can be rescheduled or planned for a Friday-Saturday anytime it suits you between 1st July and when you go away.
The prices are very competitive with what's around.
If you have any questions, please do not hesitate to contact either myself or the centre directly.
Professional Powerboat Training - wide range of training courses and craft