Level 3 does not include full gas. If you are referring to the latest city and guilds 6035 level 3. I just spent nigh on 2 years doing it.
You touch on gas and cover all the principles such as purging, pipe sizing, flueing and ventilation, gas rates and heat input, ntcs, id, , part L etc, G3, vitiation gas controls and spillage testing etc. and the course in general is heavily theory based with no practical worth talking about. I sat 6 gas exam papers which are on file for whatever reason and passed them all. They are however worthless at this point.
They are identical to the ACS papers, and I know that because we had a gas safe lad on our course who was wanting to move into training and be needed his level 3 and teacher training, we picked his brains and he said they were identical.
Also they were adjudicated amongst others by 2 well known gas safe assessors in the north east who take the re-acs etc.
But you would still have to find a placement at the end with a gas engineer and all of the details regarding what aspects of practical gas work undertaken recorded and the final ACS week paid for in addition and sat at further expense (including exam papers)
We did ask what courses follow ours on and they said nothing that they do, just uni.
That was gateshead college.
Im my opinion I am pleased I did the level 3.
We were told, perhaps as you were we would be doing gas and we were led to believe we would be qualified at the end....but we are not qualified at the end lol.
But it depends on the individual, if you want to get into gas quick, then the level 3 is not the fastest route, if you dont mind spending a further 2 years plus studying as I have then thats fine too.
The advantage of the level 3 is that with a year at uni, what I might do at some point, I can convert it into a degree for building services etc.
Cat 2 upskill is for people who hold the full level 2 6189 who are generally wet plumber's. Google it.