Search for knackered Navara. Same engine, same problems.
Timing chain and guides are just the start of it sadly. All fixable if you catch it in time.
£1000 would be the *very* lowest price say if you drove in with a perfectly healthy sounding engine and had the upgrade work without a new clutch.
£2500 is the more usual cost when you drive in with a knocking bottom end.
Unfortunately they tend to let go without any warning at all.
All +vat of course.
No connection but Billcar do superb work.