Hi Chippygeoff
Get onto 'Detecting Wales' do some reading and ask a few pertinent questions.
But to precis my 'essential' kit:
Detector
Headphones - I use Koss UR30 as supplied with my Minelab, (about £60 new), I don't believe a lot of the hype attached to choice of headphones and I've never found the need for a volume control on them.
Pinpointer probe, (Garrett about £90), expensive on the face of it but once used you will never want to be without it.
Digging tool - for beach detecting I use a stainless steel hand trowel from a garden centre, about £10.
Finds pouch - loads of useful things on EBay for not much cash.
That's it really
For digging in pasture I use a Lesche tool, a cross between a knife and a trowel, there are other makes more readily available in UK. For digging in fields I have a stainless steel border spade from B&Q which I modified with an angle grinder to give it a vee cutting edge, (about £20)
Word of warning - detecting is addictive, (but at least once you have the basic kit there's little else to buy so quite a cheap hobby when compared to the likes of golf or fly fishing).
Regards Mick