I can't answer your question (although I'm sure someone else can), but I think I've found what you're looking on ebay UK (I assume these are the ones anyway):
You haven't said what lamp this is, I assume there may a dimmer switch involved.
The important point is to locate the cause of the fuse blowing first.
The 'T' would indicate this is a slow blow fuse of 2.5 amp in glass, if you can obtain the correct physical size, I would go with the T2.5 A 250V
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