Scope is bounded by the named deliverables.
Anything outside them is priced through change control rather than absorbed as a
favour. This protects both sides, and it is the clause most often missing from
engagements that go wrong.
Your outputs are yours on payment.
The methods, models, and reusable assets I bring to the work remain mine, and you
get a licence to use them internally. If you want the machinery itself, that is a
different engagement and it is priced as one.
Payment is net thirty or better.
UK and EU clients contract with the UK company in sterling; US clients contract
with the US company in dollars. You will not be asked to pay a UK invoice in
dollars or navigate an entity that does not match your jurisdiction.
Either side can end it.
Notice period agreed up front, payment for work performed to that date, and a
handover of whatever exists. No engagement should need a hostage.