As mentioned, the Hornby model is on sale for a good price in Liverpool, however the bodyshell seems to be a bit of a hybrid. The side beading is certainly there, but it doesn't extend around the nose ends, which obviously isn't prototypical:
https://www.flickr.com/photos/16819691@N08/7442883104/in/photolist-ckGHQL-rgokfc-w2rNsG-okhNas-aF7hJB-u116YN-u11VFo-cq7ELG-sPF9Nn-nK7bqk-sajm8v-6cgK4Y-sC529A-cXVGXU-hRxQdL-AA4oiz-dabu1T-sCfA9c-t6juKp-u3rDi7-tNcaUL-u5VYG4-tNc58W-u3rKd3-u3rLFy-2boSdS-ffDG9G-3RfbC-s2fnLd-bpQBrk-fnetce-633iND-d7YFV-fkuNDV-7E5ewL-6uLB2U-6kkgTR-7DZXxc-jSkZPQ-qGZpGP-7eGLRP-nD8QEQ-ruVes8-8Sq2pC-bkjug8-oqyh5b-fwnYkg-c2LpDh-aqC4YN-qQMvSv
However, after seeing a Lima 31 325 for sale on eBay, it would appear that Lima take the beading right across the cab door, which is correct for the period up until the door was sealed:
https://www.flickr.com/photos/pics-by-john/6787605793/in/photolist-bkNfJ6-boncTX-h98SP9-9wZ1LZ-mW3BRW-iUsCYW-ebZ1ib-gTLagg-qU6hAJ-67eJbC-nYTjeN-73Yftu-6iph4z-oH3s8v-icfbew-zD1roV-eecaHt-bjB22z-8LAsPK-7muttW-kpiXeg-oE8a6c-shDHz-mMcv4y-s8t4cu-duDLrV-fUyWpY-fKz4mj-az2UCt-cwc8KU-85NbaJ-puNqCX-4cdS8q-2912Rf-ooN8pQ-ny13s9-5ZRKr1-adcKgo-o6duAX-cW6qKw-9idUaE-nXz9nu-s5rwG7-brnmSa-a6dBPR-8jhPPz-37bvEr-AksRXV-bq6cf5-cFc543
But not for the period after that, and prior to refurbishment:
https://www.flickr.com/photos/16819691@N08/7447016450/in/photolist-cm4Uxm-o2ixyM-cyPjU7-zrYXEF-aGZhxH-9a5Txg-h7Vc4Y-dDybrh-aF9Ki8-bqWdUZ-2bjqLV-5VqgN1-2x6JPc-c3rR77-3Rfjy-pgkigy-ffpz4t-bS72ZB-bkNfJ6-boncTX-h98SP9-9wZ1LZ-mW3BRW-iUsCYW-ebZ1ib-gTLagg-qU6hAJ-67eJbC-nYTjeN-73Yftu-6iph4z-oH3s8v-icfbew-zD1roV-eecaHt-bjB22z-8LAsPK-7muttW-kpiXeg-oE8a6c-shDHz-mMcv4y-s8t4cu-duDLrV-fUyWpY-fKz4mj-az2UCt-cwc8KU-85NbaJ-puNqCX
Also, the boiler port footsteps are apparent, which would certainly make it an unrefurbished example, but I wonder if the bufferbeam skirts are included in the box? I know the non- railroad version had them (I owned one before the chassis exploded), I'm not sure about the Lima examples. I model the 1970s, so now I wonder if, as you say, the Lima bodyshell is the way to go, or whether the Hornby railroad shell can be fettled adequately? Sigh...