Specialists that repair water damaged iPhones in the UK

My iPhone4 survived being in the washing machine ( !!). Worked when I pulled it out after 10m inside. I left it to dry for two weeks with silica gel. Continued to work for nine months.

Then I went running. It started to rain so I slipped the iPhone up my sleeve... where sweat appears to have been wicked from my skin into the iPhone via my running top. Result: after two weeks drying out the screen had clear imperfections and damage although everything appeared to work. A month later: the screen backlight failed and wouldn't revive. I suspect salt has damaged the screen.

What it needs is a complete clean and probably a new screen.

Other than Apple, where in the UK repairs liquid damaged iPhones? I'd like to go for a firm that specialises so they do a full clean of the insides -- to reduce the chance of more damage happening later due to salt corrosion -- as well as replacing the obviously currently damaged screen components.

Suggestions?

All appreciated. thx.