Yes when you consider it must cover many things before the first animal enclosure is constructed:
1. Land purchase
2, Parking facilities
3. Entry/ticketing building
4. Administrative and staff offices
5. Roads & visitor paths
6. Service area
7. Landscaping (even minimal)
8. Equipment, vehicles, etc.
So the plan to begin with small steps may be a modest Madagascar building with attached outdoor enclosures.
The challenge will be to convince the public that this facility is worth re-visitng.
Planning permission will not be cheap. A quick look shows the following scale of charges (may be higher/lower in Trafford).
Outline application to establish the principle: £11,000 for 2.5ha plus £1,380 per additional hectare. So 30acre (12ha roughly) would be around £24,000.
Detailed application for actual buildings (not sure whether this includes outdoor enclosures): £22,000 for 3,750 sq m plus £138 per addl 75 sq m.
So easily £50k plus to the planning authority; probably a similar sum (at least) to architects and planning consultants.
Before a brick is laid.