I've been in the USA as a UK national for 5 of the 6 last years. Had a green card for one year.
I'll probably leave the USA within 5 years.
At what time does the Exit tax become an issue? and what asset level.
It's likely when I leave i'll own a house worth $700k with a mortgage of $500k on it, but have no cash assets.
The expatriation tax only applies to U.S. Citizens or "Long-Term Permanent Residents" - those who held a Green Card for at least 8 taxable years during the period of previous 15 years. Furthermore, it applies to individuals with an average tax liability of $145,000 or net worth of $2M. From your facts, it does not appear that you have to worry about this tax.
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