It looks like Maplin recommends the 2N5320/2N5322 as a replacement/equivalent.
If you want to get picky the 2N3053 is only a 700mA part, the BC441 is a 2A part. The 3053 will work until the output gets shorted - depending on rail voltage and amplifier series output resistance you may or may not have trouble. That said, the 3053 is used in a lot of similar output driver circuits... the early 1176's are one and I think the Langevin EQ's are another.
2N5320/5322 data:
http://www.centralsemi.com/PDFs/products/2N5320-5323.PDF
And for comparison, BC441/BC461 data:
http://www.centralsemi.com/PDFs/products/LSSGP065.PDF
Mouser has the 2N devices for under $2 each. I don't claim to know everything, but the 2N5320 looks like a dang good replacement!