Tweddle, J.C., Robinson, L.D., Pocock, M.J.O. & Roy, H.E. (2012) Guide To Citizen Science: Developing, Implementing And Evaluating Citizen Science To Study Biodiversity And The Environment In The Uk. NERC/Centre for Ecology & Hydrology, Wallingford.

Ceryngier, P., Roy, H.E. & Ware, R.L. (2012) Natural Enemies Of Ladybird Beetles. In Ecology Of The Coccinellidae. Hodek, I., Honěk, A. And Van Emden, H. Kluwer Academic Publishers.

Roy, H.E., Bacon, J., Beckmann, B., Harrower, C.A., Hill, M.O., Isaac, N.J.B., Preston, C.D., Rathod, B., Rorke, S.L., Marchant, J.H., Musgrove, A.J., Noble, D.G., Sewell, J., Seeley, B., Sweet, N., Adams, L., Bishop, J., Jukes, A.R., Walker, K.J. & Pearman, D.A. (2012) Non-Native Species In Great Britain: Establishment, Detection And Reporting To Inform Effective Decision-Making. Defra.

Roy, H.E., Pocock, M.J.O., Preston, C.D., Roy, D.B., Savage, J. & Tweddle, J.C. (2012) Understanding Citizen Science And Environmental Monitoring: Final Report On Behalf Of Uk Environmental Observation Framework. NERC/Centre for Ecology & Hydrology, Wallingford.

Brown, P.M.J., Comont, R.F., Poland, R. & Roy, H.E. (2012) Wildlife reports: ladybirds. British Wildlife, 23, 208-210.

Roy, H.E., Brown, P.M.J., Frost, R. & Poland, R. (2011) Ladybirds (Coccinellidae) Of Britain And Ireland. Field Studies Council, Shrewsbury.

Roy, H.E. (2010) Coccinellids In A Changing World. In: Ecology Of Aphidophaga (Eds.: P. Kindlmann). Springer Academic Publishers, Netherlands.

Roy, H.E. (2010) Encounters with aliens Invasive species - they're here!. Catalyst, 20, 20-22.

Hill, M.O., Bacon, J., Beckmann, B., Bishop, J.D.D., Marchant, J.H., Musgrove, A.J., Rathod, B., Roy, H.E. & Sewell, J. (2010) Gb Non-Native Species Information Portal: Interim Report For The Period February 2009 To March 2010. Defra.

Roy, H.E. & Migeon, A. (2010) Non-native coccinellids in Europe. In: DAISIE: Non-natives invertebrates in Europe (ed. A. Roques). BioRisk, 4, 293–313.

Roy, H.E., Hails, R.S., Hesketh, H., Roy, D.B. & Pell, J.K. (2009) Beyond biological control: non-pest insects and their pathogens in a changing world. Insect Conservation and Diversity, 2, 65-72.

Comont, R.F., McCracken, M.E., Hesketh, H., Hails, R.S. & Roy, H.E. (2009) Bivoltine Blues: A second generation in the British Chalkhill Blue Polyommatus coridon (Lepidoptera: Lycaenidae). British Journal of Entomology and Natural History, 22.

Hill, M.O., Beckmann, B., Bishop, J.D.D., Fletcher, M.R., Lear, D.B., Marchant, J.H., Maskell, L.C., Noble, D.G., Rehfisch, M.M., Roy, H.E., Roy, S. & Sewell, J. (2009) Developing An Indicator Of The Abundance, Extent And Impact Of Invasive Non-Native Species. Final Report. Defra.

Parrott, D., Roy, S., Baker, R., Cannon, R., Eyre, D., Hill, M.O., Wagner, M., Preston, C.D., Roy, H.E. & Beckmann, B. (2009) Horizon scanning for new invasive non-native animal species in England.

Parrott, D., Roy, S., Baker, R., Cannon, R., Eyre, D., Hill, M.O., Wagner, M., Preston, C.D., Roy, H.E., Beckmann, B., Copp, G.H., Ellis, J., Laing, I., Britton, J.R., Gozlan, R.E. & Mumford, J. (2009) Horizon Scanning For New Invasive Non-Native Species In England. Report To Natural England (Natural England Contract No. Sae03-02-189). Central Science Laboratory, York.

Roy, H.E., Hesketh, H., McCracken, M.E., Pywell, R.F. & Hails, R.S. (2009) Living on the edge: interactions between Lepidoptera and parasites in fragmented habitats. Atropos, 37, 19-26.

Ribbands, B., Brown, P.M.J., Roy, H.E. & Majerus, M.E.N. (2009) The most northerly record of the harlequin ladybird (Col., Coccinellidae) in the British Isles. Entomologist's Monthly Magazine, 145, 43-44.

Roy, H.E., Beckmann, B., Comfont, R.F., Hails, R.S., Harrington, R., Medlock, J., Purse, B. & Shortall, C.R. (2009) Nuisance Insects And Climate Change. Centre for Ecology and Hydrology, Wallingford.

Edwards, R. & Roy, H.E. (2009) Provisional Atlas Of The Aculeate Hymenoptera Of The British Isles, Part 7. Centre for Ecology and Hydrology, Wallingford.

Kenis, M., Roy, H.E., Zindel, R. & Majerus, M.E.N. (2008) Current and potential management strategies against Harmonia axyridis. BioControl, 53, 235-252.

Roy, H.E. & Wajnberg, E. (2008) From biological control to invasion: the ladybird Harmonia axyridis as a model species. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 1-4. Springer Netherlands, Dordrecht.

Roy, H.E. & Wajnberg, E. (2008) From biological control to invasion: the ladybird Harmonia axyridis as a model species. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 1-4. Springer Netherlands, Dordrecht.

Murchie, A.K., Moore, J.P., Moore, G.A. & Roy, H.E. (2008) The harlequin ladybird, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), found in Ireland. Irish Naturalists' Journal,, 29, 25-26.

Holroyd, O., Brown, P.M.J., Roy, H.E. & Majerus, M.E.N. (2008) The harlequin ladybird, Harmonia axyridis, reaches Scotland. Entomologists’ Record and Journal of Variation, 120, 42-43.

Roy, H.E., Brown, P.M.J., Ware, R.L., Michie, L.J., Beckmann, B. & Majerus, M.E.N. (2008) The harlequin ladybird marches on. British Wildlife, 19, 182-186.