It would be grerat to see the variety and geographic coverage the CA forum has.
I'll start things off with my local area, Dorset & Somerset where we've had a dedicated Air Ambulance since 2000.
Our first helicopter was this Bolkow Bo-105, G-NAAB. The yellow colour scheme shows the original sponsorship, like a number of Air Ambulance Trusts, from the AA.

The Bo-105 was upgraded to a Eurocopter EC135 in 2007, G-DORS

In 2017 the UK set up Major Trauma Units and with none in Dorset or Somerset, transit times increased significantly and it was decided that the crew would need a Trauma Doctor in addition to the paramedics. This brought about the procurement of the larger Agusta-Westland AW169, G-DSAA 'Pegasus'.

The AW-169 operates with the undercarriage extended and these pads fitted, I guess to stop it sinking in to the gert lush Somerset turf.
There's alot of overlap in these parts between the Air Ambulance Trusts and we regularly see the Wiltshire Bell 429, Devon EC135 and Great Western EC135.
Let's see those from your area.
Neil