[Gremlin]

I have very similar type bulbs in two of my rooms Margaret and have tried to get some spares but not had any luck locally.
I changed the fitting on the end of the hanging down wire for conventional ones eventually.
I have since been told that the electrical wholesaler at the start of Electricity street sells the type you are looking for, they will serve customers who are non-trade.
383421 is the number to phone.

Holland House at the top of Church street is another electrical store but I don't know if it is trade only

Best of luck.