Martin's Haven 11-12 October: first Redwing

Saturday was, predictably, a bit of a washout, but was saved by a Water Rail calling in the ditch below Lockley Lodge and a flock of c.25 Choughs flying from the Deer Park.
Sunday morning had really good numbers (30+) of Skylarks in the big fallow field to the south of the NT car park, and several similar-sized flocks of Linnets over and feeding in the turnip field. As the sun came out mid-morning we had continuous movement from the west into and through the scrub in the valley. Highlights were my first Redwing of the autumn, a male and female Blackcap, 5+ chiffchaffs, 2 coal tits, a female chaffinch and the resident male Kestrel sitting on the Deer Park wall. Other than the Linnet flocks, the most numerous birds were Meadow and a few Rock Pipits that paused on the wall before flying inland, and Stonechats.
Found a very small Palmate Newt looking for somewhere to hibernate in the garden shed, and saw 2 Common Lizards catching some late autumn sun. Loads of very large (up to 4") and very hairy caterpillars on the heather in the Deer Park. Can anyone tell me what these are likely to be?