Many thanks for all the responses.
I had my second opinion today and this too has confirmed that further surgery is not really feasible. My tumour has spread in a linear fashion along the collar bone (on both sides) in the last 2 weeks and it has broken through the skin and begun to weep.Further surgery will not remove it all and the drastic nature of any such surgery will give me a number of issues/complications re. QOL, considering secondary treatment (chemo & radiotherapy) has been ruled out.
I'm being referred for consideration for Photodynamic therapy next week. This avenue is by no means a certainty, so I may have reached the end of the treatment road already.I knew one day that this would happen, but still it's an odd feeling.