The burner make and number should be on a plate attached to it somewhere... it could be an EOGB, Bentone, Sterling or whatever. Look at heating-parts.co.uk for an on line catalogue with pictures which should help you to indentify what you need.
John
November 2009
I can answer this question...
how do i find a part number for my worcester heatslave 15/19 oil boiler?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.