Hi cimore000,
I passed my Initial Class 1 done last Friday so hopefully I will be of some help. The Class one consists of an eye sight test which comprises of a 30min test that you would have at your local eye clinic - this will go on longer if you have any problems/issues.
The colour tests involve ishihara tests, if you fail any one of these you need to pay £45 for the lantern tests which involve coloured beams from a machine. If you fail these, then they pass you onto a second lantern with a different pattern apparently.
The blood test is a finger prick test which they measure your haemoglobin levels.
I would say the hearing test is hardest of all - which the technician stated other people say it is too. The bleeps are very quiet.
Aside from the lung capacity checks etc you will be examined by a doctor who will inspect things from reflexes to whether you have a hernia etc. The whole process takes around 3 hours (for perfect candidate).