Not sure I understand you Whirly...
Our colleague states he/she has held a class 1 previously, therefore any future class 1 will be a renewal or revalidation. This can be done at an appropriate AME. There is no clause about having to undergo an initial medical again.
My original advice is effectively what the AME recommended too.
LASORS mainly covers licencing. The CAA website has details on renewing/ revalidating medicals here:
http://www.caa.co.uk/docs/49/SRG_MED...piry_Dates.pdf but I couldn't find anything on the class 1 to class 2 reversion bits.