A member will be considered to have left the space 4 months after no longer paying a membership fee by Standing Order. (from The_35L_Rule)
At such times a combined notice to sell or dispose of abandoned goods should be sent via recorded delivery or registered letter. This is to meet legal requirements under the Torts (Interference with Goods) Act 1977, Schedule 1 - Uncollected Goods parts I and II.
A sample notice is given below.
Dear [former members name],
Following your recent departure from NottingHack, we hereby serve you notice that your goods [list of goods which have been abandoned] are now due for collection. Goods must be collected within [14 days if member lives in Nottingham or 28 days if they live further away].
Goods which are not collected during this time will be disposed of by NottingHack. If any goods are deemed by us to have a monetary value they shall be sold, and expenses for arranging the sale will be deducted from any amount raised. Any sum remaining shall be forwarded to you.
Any goods which we believe the value of will not cover the costs of arranging for sale will be destroyed/disposed of.
Once the notice has elapsed then the potential value of any goods should be discussed at the next board meeting and an agreement to sell or dispose of the goods should be reached.