Just picked this thread up.
What an awful situation which must be causing you a lot of stress. Although the opinions on the Parish Councillor may be valid, they honestly wont help solve this problem.
I pick up a lot of similar threads on the Dog Forums I am on, so please be assured this is not uncommon. A few bits of advice for you I hope will help
1. the ultrasonic gadget thingy is only a short term fix, you need a longer term solution to the behaviour
2. someone said get a decent behaviourist....Get a decent behaviourist. Check out APBC for one near you (don't go with any Ads, decent behaviourists work on referral). Go you your vet to check out any health issues first. If your Vet refers you to the behaviourist and you have good insurance, your insurance will cover the costs
3. the barking is a form of anxiety. Until the behaviourist comes along. Practice fake 'leavings of the house' Start by putting your jackets on or whatever you normally do to get ready to leave. When the dogs calm down reward them. Increase this to gradually to going out the door, reward when calm, leave house for longer, reward when calm and gradually build up over a number of weeks or months until the association in your dogs' minds is that staying calm when you leave is a really really good thing that will get them a reward. I imagine the behaviourist will advise something similat but will be much more helpful than a message on a forum.
4. I didn't pick up how long your dogs are left for. If more than 3 or 4 hours whilst you are at work can you get someone to take them for a short walk? Otherwise you really need to consider paying a dog walker. Or an you nip home a lunchtime?
5. Have you thought about getting involved in a dog sport to occupy your dogs minds? Check out Agility, Working Trials, Obedience....lots of stuff out there!
6. How long do you walk your Dogs before you leave for work? About the only one thing all dog trainers will agree on is exercise. I take mine out for just under an hour before getting ready for work. It means a very early start but I just love having the fields to myself on lovely summers mornings.
7. Good luck!