Can you help to identify these frames, bikes or parts?

The original lug was replaced with XB3.

I doubt it being a Carlton as it seem to have different crowns. A Raleigh maybe?

Any further info is welcome. Thanks!

I'm not sure, but I can promise my carlton has almost identical fork crowns to that. almost identical to raleigh track frames from that period too- they were basically interchangeable by that stage it seems.(as Raleigh bought out Carlton in 1960.) The serial number is definitely F followed by a four digit number too, as were some Raleighs of this period. It doesn't have an oval stamp mind.