We've got some half price cracked ice and miles and miles of carpet tiles,
T.V.s, deep freeze and David Bowie L.P.s,
Ball games, gold chains, whassa-names, and at a push,
Some Trevor Francis track suits from a mush in Shepherds Bush,
Bush, bush, bush, bush, bush, bush, bush ...
No income tax, no V.A.T.,
No money back, no guarantee,
Black or white, rich or poor,
We'll cut prices at a stroke...
God bless Hooky Street,
Viva Hooky Street,
Long live Hooky Street,
C'est magnifique, Hooky Street,
Magnifique, Hooky Street,
The theme song is describing what merchandise Del Boy and Rodney sell; Trevor Francis used to play for Millwall...and the word "mush" is slang for friend or mate. So the meaning is they acquired Trevor Francis tracksuits to sell on from a friend or mate who lives in Shepherds Bush.
Hope this helps gaz