depends where in Kent there is a good one near hextable just near Dartford Kent its called rowhillgrange go to http://www.rowhillgrangehotel.co.uk …………they do everything from there from spas to massages waxing etc also have a lovely pool and gym area well worth a visit ………..please let us know if you go there .

you can either ask the manufacturer for a data sheet, and trust that the info is correct, or you can buy expensive equipment and test it yourself.

For example, wheel encoder test is probably the simplest, you need a precision rotary angle indicator (don't know what it's called) and something to measure the digital outputs.

The IR sensor, you need a precision IR source.

etc.

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Yes, you need to know them. w3schools.com has the best tutorials for learning them. HTML, XHTML then CSS — in that order. You shouldn't find it too difficult.

edit..
If you know these then you can create a web-site directly in a code editing software (or just notepad). Without knowing them you won't get very far using Dreamweaver.

Photoshop can do batch converts. You use the "Action" pallet to record a new action on one file. Then save the action recorded, and mass convert as many files as you want.