Okay, I can confirm the unidentified tree I posted about yesterday is a Rhus
Typhina (Stags Horn Sumach).

So my dilemma now is should I stick with my original choice (Sorbus
Vilmorinii) or go with the Sumach?

As previously mentioned the tree will be planted in a tumble dryer drum so
unwanted spread & overall height should be kept in check.

I would be grateful for opionions and/or comments.

TIA,

Pam in Kent