I've never seen a No 4 - .410 Tom but have always had a fancy for the SMLE version.
I've owned a deac No1 MK111* which I was fond of and I came very close once about 44 years ago to being the proud owner of the plastic toy version. The vote on that one didn't go in my favour that day
and I've only ever seen one other since.
I believe they were made by Airfix and no doubt you could finance a nice .410 if you found one of these still in the box in your loft. I read on a website site recently that a small quantity of some thing similar to the Airfix ones were found in a novelty shop in NZ I think and they were snapped up pretty quick.
I had the pleasure of shooting both the SMLE and N04 .303 about 18 months ago at Bisley, something I had always wanted to do and it was a real treat
Regards
Ry