In my working life, which spans 5 decades, asbestos was often just in sheet form (e.g. Asbestolux fireboard - white, cement asbestos board - grey, often corrugated), sometimes loose fill (combined with cellulose - generally required a compressor to blow into place), spray asbestos (which required specialist application equipment) and pipe lagging. The latter two were normally restricted to boiler rooms, boiler laggings, steam pipes, etc). Never seen asbestos in rolls other than for steam pipe/boiler lagging, a specialist trade - and even then it was grey. Not something B&Q would have ever sold. That's not to say it wasn't in use, but the extremely short fibre length of asbestos means that to make use of it it needs to be combined with other materials and/or woven into a product (e.g the asbestos/cotton rope used in sash windows).
If the OPs is an orangey/pink or orangey/yellow colour it is most likely to be fibre glass which started coming in in the late 60s/early 70s for DIY insulation (mineral wool was really a product of the 1980s). Prior to fibreglass coming in one of the few available loft insulations was cellulose fibre insulation board, such as Sundaela (no asbestos in it, but a begger to cut). That was most often nailed to the undersides of rafters when it was used