Unfortuantly the NHS system is still a bit of a post code lottery and I could go in to the politics of how this has come about through successive governments, but that would be a breach of the forum rules
Basically you need to be persistant and give a detailed explanation of what the issues you are experiencing with your current lenses.
What are the situations cause your eyes to go red?
What environment do you work in?
How long can you wear lenses for?
How frequently are you having to use eye drops?
How frequently you need to remove lenses to rest your eyes throughout the day?
What has been tried to aleviate the problems you are experiencing and the results of each?
The flip side is, you could be sensitive the the contact lens solutions and / or eye drops you use. I have to use preservative free eye drops and saline, otherwise even with soft lenses, I will get eye irritation.
At work you say your eyes get tired and red and most people that put that in a post work in an air conditioned office environment. If this is the case, get yourself a Display Screen Equipment assessment which is a legal requirement if you use a computer for greater than 50% of your time. Consider not only the way your work station is organised, but the lighting, proximity to airconditioning, software that is used, how frequent the brakes are. Frequent short breaks are far better such as going to the drinks fountain or retreiving paper from a printer every 30 to 45 minutes rather than taking long breaks after a couple of hours where you get a cup of tea. This is the recomendation for those with no visual problems!
It has been proven that with contact lenses, many people blink less and it has also been proven that if you look at a display screen, read a book or watch TV, your blink rate goes down. COntact lenses, especially rigid contact lenses do contribute to tear film breakup so where at one point you may have never shown symptoms of dry eye, you do now. Put all these three together and you end up with a lot of people have dry and sore eyes when they use a computer in a moder office environment with air conditioning. Many fix this using any combination of lubricating eye drops of which there are many and the most effective ones reprted here are Systane and Clinitis Soothe, having a small humidifier in the vacinity of your work station and substituting cafeine drinks (which includes tea) which are dieretics for water and keeping hydrated.
The more you can make a practitioner understand the issues you are having, the more likely you are to bring about change. Most of these peoples experience of KC is treating people and so have no idea what it is with living with the condition and being so reliant on contact lenses and as our expereinces are so different we need to be very clear on waht the issues are.