Malaysian Airlines flies London to Medan, via Kuala Lumpur from £589, bookable through Trailfinders, 0845 0585858.

Bus from Pinang Baris bus station in Medan. The journey to Bukit Lawang takes about three hours.

Room rates usually start from about £4.50-£5.50 at the Jungle Inn and the Garden Inn, the nearest hotels to the feeding centre. Bukit Lawang Ecolodge costs around £7 a night for a double.

Treks range from a three-hour walk (£11pp) to six-day tours (£96pp). All tours include guide, park permits, snacks and meals (minimum three people).

Guides: choose your guide carefully. Authorised guides carry identification.