Just read this thread. I find that Fleetwood Nautical College offers a really good value survival and medical. Unless things have changed you do not pay VAT there due to its status so it is 20 percent cheaper instantly.
I do my medicals at a local doctors surgery. The combined UK and Norwegian medicals cost around 65 pounds. An ENG 1 medical cost 60 pounds.
Banksman courses are a good idea but not essential. That is the kind of training most companies give you anyway. For the benefit of those who do not know the banksman is the guy on the deck who directs the crane using hand signals.