Any way you want to portray it, the numbers have gone up. Not down. Not stayed the same. Gone up.
They haven't.
If you take the most serious firearms offence, murder, the figure in 1995, the last full year before the "ban", the figures for E&W were 70 homicides involving firearms.
The figure for 2003/04 was 68.
That's not a rise, it's a very slight decrease. That's despite a huge rise in illegal immigration and drug dealing.
If you look at robberies with firearms, in 1995 there were 4,206 in E&W, in 2003/04 there were 4,117.
Again, not a rise. (Britain's population has increased as well in the time period, so it's a greater fall per head)
If you look at the proportion of robberies that involve a firearm, it's declined from 6.2% in 1995 to 4.1% in 2003/04
In homicides, 9.4% involved a firearm in 1995, 8.0% in 2003/04
What has really gone up are the number of replicas and air weapons used in "crime", and especially the reporting of such "crimes".
Ten years ago, a kid trespassing on someone's land with an air rifle would have been ignored, now they aqre reported to the police, who react to every such report as if it were a madman on a rampage. As a result, things like that, or children shooting an air rifle at a road sign, are not recorded as "firearms" crimes.
In 1992, there were about 6,000 air weapon crimes recorded. In 2003/04 there were over 14,000.
The other thing that's usually claimed is that "violent crime" has risen in Britain since the mid 90s, but the truth is that much tighter standards for recording minor crimes was introduced at the same time, and that's responsible for the reported increase.
Most countries have an alternative set of crime figures, that's much more comprehensive than the police recorded figures (the police tend to record more serious incidents, minor ones are frequently not reported).
In the US, such figures are recorded by the DoJ in their victimisation surveys, in the UK it's the British Crime Survey. The BCS shows that 1995 was the peak year for violent crime in E&W, with about 4.2 million "violent" incidents. That's fallen every year since, and now stands at about 2.7 million "violent" incidents per year.
(Note I'm not claiming the changes to the firearms laws since the mid 90s have caused this, the truth is the laws in place before that (licencing, registration, safe storage etc) were strict enough to remove legal weapons as a major factor in crime)